UM90024

4 kW analogue bridgeless totem-pole PFC evaluation board
Rev. 1.0 — 21 November 2023

user manual

Document information
Information

Content

Keywords

GaN FET, PFC, evaluation board, circuit design, PCB layout

Abstract

The analogue totem-pole PFC evaluation board is a bridgeless totem-pole Power-factorCorrection (PFC) circuit.

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board

1. EVALUATION BOARD TERMS OF USE
The use of the Evaluation Board is subject to the Evaluation Board Terms of Use, which you canfind here. By using this Evaluation Board, you accept these terms.

2. High Voltage Safety Precautions
Read all safety precautions before use!
Please note that this document covers only the 4kW analogue bridgeless totem-pole PFC
evaluation board and its functions. For additional information, please refer to the ProductSpecification
To ensure safe operation, please carefully read all precautions before handling the evaluation
board. Depending on the configuration of the board and voltages used, potentially lethal voltages
may be generated. Therefore, please make sure to read and observe all safety precautions
described below.
Before Use:
It is recommended that ALL operation and testing of the evaluation board is performed with theboard enclosed within a non-conductive enclosure that prevents the High Voltage supply to be
switched whilst open and accessible; see Fig. 1.

Fig. 1.

UM90024user manual

Example of a safety enclosure in the Nexperia lab

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4 kW analogue bridgeless totem-pole PFC evaluation board
All probes should be position before turning on the High Voltage and should be held in place using
a suitable probe positioner e.g. PMK MSA100; see Fig. 2.

Fig. 2.

Example of a probe positioner

Always use an oscilloscope with protective earth connected.
When probing High Voltage, ensure that the probes have the correct voltage rating / limit.
Ensure that all scope probes are compensated and de-skewed before use, refer to youroscilloscope or probe manual for instructions on how to do this.
If possible, have a visual indicator of High Voltage located close to the evaluation board (LED bargraph or voltmeter) To show when the Bus Voltage (Vbus) and Outputs are at dangerous levels.
Verify that none of the parts or components are damaged or missing.
Check that there are no conductive foreign objects on the board.
If any soldering or modifications are made or carried out, then please ensure that this is done
carefully so that solder splashes and debris are not created. Clean the board with Iso-propylalcohol and allow it to dry.
Ensure that there is no condensation or moisture droplets on the circuit board, all testing should be
carried out within a dry environment without excessive humidity.
If used under conditions beyond the rated voltage and current specification, this may cause
defects, failure and or permanent damage.
NEVER handle the evaluation board during operation under ANY circumstances
After use the Nexperia Evaluation Board contains components which may store high voltage andwill take time to discharge. Carefully probe the evaluation board once the power has been removed
to check that all capacitors have been discharged. You must do this without touching the board
except for the multimeter probes that are being used to check.
This evaluation board is intended for use only in High Voltage Lab environments and should
be handled only by qualified personnel familiar with all safety and operating procedures. We
recommend carrying out operation and testing in a safe environment that includes restricted accessonly to trained personnel, the use of High Voltage signage at all entrances, safety interlocks andemergency stops and HV insulated flooring.
It should be noted that this evaluation board is intended to be used ONLY for evaluation purposesand should not be used by consumers or designed into consumer equipment in its current form.

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Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board

3. Introduction
The Nexperia Analogue Totem-Pole PFC evaluation board implements a bridgeless totem-pole
Power-Factor- Correction (PFC) circuit, using Nexperia power GaN FETs. By using a diode-free
power GaN FET bridge with low reverse-recovery charge, very-high-efficiency single-phase AC-DC
conversion is realized. In this circuit, the performance and efficiency improvement are achieved byuse of GaN FETs in both the fast-switching and slow-switching legs of the circuit. The evaluation
board is shown in Fig. 3 and Fig. 4.

Fig. 3.

4 kW analogue totem-pole PFC evaluation board; top view with control card and heatsink fitted

Fig. 4.

4 kW analogue totem-pole PFC evaluation board; top view of GaN FETs (heatsink removed)

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4 kW analogue bridgeless totem-pole PFC evaluation board

3.1. Warnings
This demo board is intended to demonstrate GaN FET technology. While it provides the mainfeatures of a totem-pole PFC, it is not intended to be a finished product and does not have all
the protection features found in commercial power supplies. Along with this explanation go a few
warnings which should be kept in mind:
1. An isolated AC source should be used for the input.
2. Use either a passive resistive load or an electronic load set to resistance mode: 360 W to 2000
W lowline, 360 W to 4000 W highline.
3. The demo board is not fully tested at large load steps. DO NOT apply a very large step in theload (>1000 W) when it is running.
4. DO NOT manually probe the waveforms when the demo is running. Set up probing before
powering up the demo board.
5. DO NOT touch any part of the demo board when it is running.
6. When plugging the daughterboard into the sockets, make sure that the daughterboard is fully
pushed down.
7. It is not recommended to use a passive voltage probe for VDS and VGS measurements while
simultaneously using a differential voltage probe for Vin measurements unless the differential
probe has very good dv/dt immunity.
8. BE AWARE that DC negative and AC neutral are not the same node, and that unless proper
caution is taken with instrument grounding, a severe fault condition could be created.

3.2. Quick reference information
Table 1. 4 kW Analogue Totem-pole PFC evaluation board Input/Output specifications
Parameter
Value
Input voltage

85 VAC to 265 VAC; 47 Hz to 63 Hz

Input current

18 A (RMS): (2000 W at 115 VAC; 4000 W at 230 VAC)

Ambient temperature<50 °C

Output voltage

385 VDC ±5 VDC

PWM frequency

65 kHzPower dissipation in the GaN FET is limited by the maximum junction temperature. Refer to the
GAN039-650NTB data sheet.

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4 kW analogue bridgeless totem-pole PFC evaluation board

4. Circuit description
The bridgeless totem-pole topology is shown in Fig. 5 below. As shown in Fig. 5 (a), two GaN FETs
Q1 and Q2 and two diodes D1 and D2 are used for the line rectification, while in Fig. 5 (b), thecircuit is modified, and the diodes are replaced by two further GaN FETs Q3 and Q4 to eliminate
diode forward voltage drops and improve efficiency.
aaa-037756

Q1

Q1
il

D2

Vi

Q3
Vi

il
VIN

VIN

VD

VD

D1

Q2

Q2

(b) GaN FET for line rectification(a) Diode for line rectification

Fig. 5.

Q4

Totem-pole bridgeless PFC converter based on GaN FETThe large recovery charge (Qr) of existing silicon MOSFETs makes CCM operation of a silicon
totem-pole bridgeless PFC impractical and reduces the total efficiency. Table 2 below compares the
Nexperia GAN039-650NTB GaN FET to an equivalent CoolMOS MOSFET.
Table 2. GaN FET and equivalent CoolMOS MOSFET key parameter comparison
Parameter

GAN039-650NTB

IPW65R041CFD

RDSon (max)

39 mΩ

41 mΩ

ID

60 A

68.5 A

QG

26 nC

300 nCQr

187 nC

1.9 µCA GaN FET totem-pole PFC in Continuous Conduction Mode (CCM) focusing on minimizing
conduction losses was designed. A simplified schematic is shown in Fig. 6 (a). It consists of apair of fast GaN FET switches (Q1 and Q2) operating at a high pulse width modulation (PWM)
frequency and another pair of GaN FET switches (Q3 and Q4) operating at a much lower line
frequency (50/60 Hz). The primary current path includes one fast switch and one slow switch only,with no diode drop. The function of Q3 and Q4 is that of a synchronized rectifier as illustrated inFig. 6 (b) and Fig. 6 (c). During the positive AC cycle, Q4 is on and Q3 is off, forcing the AC neutralline to be tied to the negative terminal of the DC output. The opposite applies for the negative
cycle.

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4 kW analogue bridgeless totem-pole PFC evaluation board
V O+

aaa-037757

Q3

Q1
LB

VS

VIN
N

Q2

Q4
V O-

(a) Simplified schematic
V O+

V O+
Q1
LB

Q3

Q1
LB

VS

Q3
VS

VIN

VIN

N

N

Q2

Q2

Q4

Q4
V O-

V O-

(b) Positive AC half-cycle

Fig. 6.

(c) Negative AC half-cycle

GaN FET totem-pole bridgeless PFC converter
In either AC polarity, the two fast-switching GaN FETs (Q1 and Q2) form a synchronized boost
converter with one transistor acting as a master switch to allow energy intake by the boost inductor(LB) and the other transistor as a slave switch to release energy to the DC output. The roles of
the two GaN FET devices interchange when the polarity of the AC input changes; therefore, eachtransistor must be able to perform both master and slave functions. To avoid shoot through, adead time is built in between two switching events during which both transistors are momentarily
off. To allow CCM operation, the slave transistor must function as a flyback diode for the inductor
current to flow during the dead time. The diode current, however, must quickly reduce to zeroand transition to the reverse blocking state once the master switch turns on. This is the criticalprocess for a totem pole PFC which previously lead to abnormal spikes, instability and associatedhigh switching losses due to the high Qr of the body diode in modern high-voltage Si MOSFETs.
The low Qr of the GaN FET switches allows designers to overcome this barrier. As seen in Fig. 7,
inductive tests at 400 V bus using the high-side GaN FET as a master switch show healthy voltage
waveforms up to inductor current exceeding 35 A. Refer to Section 7 for more details.
With a design goal of 4.4 kW output power in CCM mode at 230 VAC input, the required inductor
current is 20 A. This test confirms a successful totem-pole power block with enough current
overhead.
One inherent issue in bridgeless totem-pole PFC is the operation mode transition at AC voltage
zero-crossing. For instance, when the circuit operation mode changes from positive half-cycle tonegative half-cycle at the zero-crossing, the duty ratio of switch Q2 changes abruptly from almost
100% to 0%, and the duty ratio of switch Q1 changes from 0% to 100%. Due to the slow reverse
recovery of diodes (or body diode of MOSFET), the voltage VS cannot jump from ground to VDC
instantly; a current spike will be induced. To avoid the problem, a soft-start sequence with a duty
ratio ramp is employed for a short period at each AC zero-crossing for better stability. Since theAnalogue totem-pole bridgeless PFC is designed to run in CCM, the larger inductance alleviates
the current spike issue at zero-crossing.

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4 kW analogue bridgeless totem-pole PFC evaluation board

High-side as masterFig. 7.

Hard-switched waveform of a pair of GaN FET switches

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4 kW analogue bridgeless totem-pole PFC evaluation board

5. Design details
For this evaluation board, the PFC circuit has been implemented on a 4-layer PCB, with 2 ozcopper for the outer layers and 1.5 oz copper for the inner layers. GAN039-650NTB devices by
Nexperia are used for both the fast and slow switching legs. The inductor is made of a High Flux
core with the inductance of 480 μH and a DC resistance of 0.025 Ω, designed to operate at 65 kHz.
A simple 4 A rated high/low side driver IC (Si8273) with 0 V and 12 V as the on/off voltage levels
directly drives each GaN FET. A TI UCC28180DR controller IC handles the control algorithm.
The voltage and current loop controls are those of a conventional boost PFC converter. The
feedback signals are DC output voltage (VDC_OUT), AC input potential (LIVE_IN/POWER_IN)
and inductor current (I_SENSE). The input voltage polarity and RMS value are determined from
LIVE_IN/POWER_IN. The outer voltage loop output multiplied by |VAC| gives a sinusoidal current
reference. The current loop gives the proper duty ratio for the boost circuit. The polarity determines
how the PWM signal is distributed to drive Q1 and Q2. A soft-start sequence with a duty ratio ramp
is employed for a short period at each AC zero-crossing for better stability.
The circuit schematic, PCB layout and bill of materials for the Analogue bridgeless totem-pole PFC
evaluation boards are shown in the next sections.

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4 kW analogue bridgeless totem-pole PFC evaluation board

5.1. Mainboard schematics

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4 kW analogue bridgeless totem-pole PFC evaluation board

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4 kW analogue bridgeless totem-pole PFC evaluation board

5.2. Mainboard PCB layout

Fig. 8.

UM90024

Mainboard PCB top layeruser manual

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Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board

Fig. 9.

Mainboard PCB bottom layer

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4 kW analogue bridgeless totem-pole PFC evaluation board

Fig. 10. Mainboard PCB inner layers 2 (ground place) and 3 (power and ground planes)

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4 kW analogue bridgeless totem-pole PFC evaluation board

5.3. Daughterboard schematics

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4 kW analogue bridgeless totem-pole PFC evaluation board

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4 kW analogue bridgeless totem-pole PFC evaluation board

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4 kW analogue bridgeless totem-pole PFC evaluation board

5.4. Daughterboard PCB Layout

Fig. 11. Daughterboard PCB top layer

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4 kW analogue bridgeless totem-pole PFC evaluation board

Fig. 12. Daughterboard PCB bottom layer

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4 kW analogue bridgeless totem-pole PFC evaluation board

Fig. 13. Daughterboard PCB inner layers 2 (ground place) and 3 (power and ground planes)

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4 kW analogue bridgeless totem-pole PFC evaluation board

5.5. Mainboard Bill of Materials
Table 3. Mainboard Bill of Material
Part
Value
Voltage Package

Description

Supplier

Supplier P/N

C1

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C2

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C3

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C4

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C5

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C6

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C7

100p

100V

C0603

Capacitor, Ceramic,
C0G

Farnell

1740605

C8

100p

100V

C0603

Capacitor, Ceramic,
C0G

Farnell

1740605

C9

-

-

C0805

Capacitor, Ceramic

-

-

C10

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C11

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C12

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C13

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C14

100n

50V

C0603

Capacitor, CeramicRS

114-0367

C15

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C16

-

-

C0805

Capacitor, Ceramic

-

-

C18

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C19

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C20

100p

100V

C0603

Capacitor, Ceramic,
C0G

Farnell

1740605

C21

100p

100V

C0603

Capacitor, Ceramic,
C0G

Farnell

1740605

C22

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C23

10u

25V

C0805

Capacitor, Ceramic

Farnell

1735530

C26

1u

25V

C0603

Capacitor, Ceramic

Farnell

2346962

C27

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C28

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C29

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C30

22u

25V

C0805

Capacitor, Ceramic

Farnell

1907510

C32

-

-

C2220

Capacitor, Ceramic

-

-

C33

-

-

C2220

Capacitor, Ceramic

-

-

C34

680n

450V

C2220

Capacitor, Ceramic

Mouser

810CGA9M4X7T2W864MA

C35

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

C36

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

C37

470u

450V

RadialCapacitor, Electrolytic Mouser

80-ALC10A471DF450

C38

470u

450V

RadialCapacitor, Electrolytic Mouser

80-ALC10A471DF450

C39

470u

450V

RadialCapacitor, Electrolytic Mouser

80-ALC10A471DF450

C40

470u

450V

RadialCapacitor, Electrolytic Mouser

80-ALC10A471DF450

C50

10n

1kV

C1206

Capacitor, Ceramic

581-1206AC103KAT2A

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4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

Voltage Package

Description

Supplier

Supplier P/N

C51

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

C52

-

-

C1210

Capacitor, Ceramic

-

-

C53

-

-

C1210

Capacitor, Ceramic

-

-

C54

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

CMC1

CMC 3.9mH 25A 2LN DigiKeyTH

2258-T60405R6128X225ND

CMC2

CMC 3.9mH 25A 2LN DigiKeyTH

2258-T60405R6128X225ND

CX1

1.5u

310V

RadialCapacitor, PP Film

Mouser710-890334026030CS

CX2

1.5u

310V

RadialCapacitor, PP Film

Mouser710-890334026030CS

CX3

1.5u

310V

RadialCapacitor, PP Film

Mouser710-890334026030CS

CY1

4.7n

630V

RadialCapacitor, PP Film

DigiKey

BC1615-ND

CY2

4.7n

630V

RadialCapacitor, PP Film

DigiKey

BC1615-ND

D1

PMEG 2020EJ

20V

SOD-323

Diode, Schottky

Nexperia

PMEG2020EJ

D2

ES1J

600V

DO-214AC

Diode

Farnell

3519291

D3

PMEG 6002EB

60V

SOD-523

Diode, Schottky

Nexperia

PMEG6002EB

D4

ES1J

600V

DO-214AC

Diode

Farnell

3519291

D5--

DO-214AC

Diode

-

-

D6

-

-

DO-214AC

Diode

-

-

D11

GBJ2506-F

600V

Bridge Rectifier

Farnell

3127402

Fuse Clip TH

Farnell

2762088

F1
F1

Fuse

Farnell

1150557

FB11

30R

FB0603FerriteFarnell

1515741FB1230R

FB0603FerriteFarnell

1515741FB13

30R

FB0603FerriteFarnell

1515741FB1430R

FB0603FerriteFarnell

1515741

J1

4-Pin Header TH

RS

144-8185

JP1

Jumper Link SMD

Farnell

2751488

JP2

Jumper Link SMD

Farnell

2751488

K1

Relay SPST-NO 30A

Farnell

2395974

L1

480uH

L2

46.65uH

LED1

LED

D0603

LED, Green

Farnell

8529833

LED2

LED

D0603

LED, Green

Farnell

8529833

LED3

LED

D0603

LED, Green

Farnell

8529833

LED4

LED

D0603

LED, Green

Farnell

8529833

LED6

LED

D0603

LED, Green

Farnell

8529833

LED7

LED

D0603

LED, Green

Farnell

8529833

LED8

LED

D0603

LED, Red

Farnell

2099224

Q1

GAN039 -650NTB 650V

CCPAK

GaN FET

Nexperia

GAN039-650NTB

Q2

GAN039 -650NTB 650V

CCPAK

GaN FET

Nexperia

GAN039-650NTB

Q3

GAN039 -650NTB 650V

CCPAK

GaN FET

Nexperia

GAN039-650NTB

Q4

GAN039 -650NTB 650V

CCPAK

GaN FET

Nexperia

GAN039-650NTB

Q5-

TO-247MOSFET--

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4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

Voltage Package

Description

Supplier

Supplier P/N

Q6

-

-

TO-247MOSFET

-

-

R1

10R

R1206

Resistor

Farnell

1738986

R2

15R

R0805

Resistor

Farnell

2057671

R3

15R

R0805

Resistor

Farnell

2057671

R4

10R

R1206

Resistor

Farnell

1738986

R5

10R

R1206

Resistor

Farnell

1738986

R6

100R

R0805

Resistor

Farnell

1750741

R7

15R

R0603

Resistor

Farnell

2335857

R8

10R

R1206

Resistor

Farnell

1738986

R9

15R

R0805

Resistor

Farnell

2057671

R10

15R

R0603

Resistor

Farnell

2335857

R11

37.4k

R1206

Resistor

Farnell

2307665

R12

37.4k

R1206

Resistor

Farnell

2307665

R13

37.4k

R1206

Resistor

Farnell

2307665

R14

37.4k

R1206

Resistor

Farnell

2307665

R15

37.4k

R1206

Resistor

Farnell

2307665

R16

37.4k

R1206

Resistor

Farnell

2307665

R17

47R

Inrush current limiter

DigiKey317-1220-ND

R18

47R

Inrush current limiter

DigiKey317-1220-ND

R19

10R

R1206

Resistor

Farnell

1738986

R20

10R

R1206

Resistor

Farnell

1738986

R21

15R

R0603

Resistor

Farnell

2335857

R22

10k

R0603

Resistor

RS

566-890

R23

10k

R0603

Resistor

RS

566-890

R24

10k

R0603

Resistor

RS

566-890

R25

10k

R0603

Resistor

RS

566-890

R26

15R

R0603

Resistor

Farnell

2335857

R27

10k

R0603

Resistor

RS

566-890

R28

10k

R0603

Resistor

RS

566-890

R30

51k

R0603

Resistor

Farnell

2059471

R31

33k

R0603

Resistor

Farnell

2303204

R32

10k

R0603

Resistor

RS

566-890

R33

10k

R0603

Resistor

RS

566-890

R34

4.7k

R0603

Resistor

Farnell

2303181

R35

4.7k

R0603

Resistor

Farnell

2303181

R36

4.7k

R0603

Resistor

Farnell

2303181

R37

4.7k

R0603

Resistor

Farnell

2303181

R41

10R

R1206

Resistor

Farnell

1738986

R43

-

R0805

Resistor

-

-

R44

-

R0805

Resistor

-

-

R45

-

R0603

Resistor

-

-

R46

-

R0603

Resistor

-

-

R47

2k

R0603

Resistor

Farnell

2059343

R48

2k

R0603

Resistor

Farnell

2059343

UM90024user manual

All information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

23 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

R50

4m

R51

Voltage Package

Description

Supplier

Supplier P/N

R2512

Resistor

DigiKey

YAG6087CT-ND

4m

R2512

Resistor

DigiKey

YAG6087CT-ND

R52

37.4k

R1206

Resistor

Farnell

2307665

R53

37.4k

R1206

Resistor

Farnell

2307665

R54

37.4k

R1206

Resistor

Farnell

2307665

R55

37.4k

R1206

Resistor

Farnell

2307665

R56

0R

R1206

Resistor

Farnell

2797493

R57

10R

R1206

Resistor

Farnell

1738986

U1

Si8273BBD -ISR1 2.5kV

SOIC16

ISO Hi/Lo gate driver

Mouser

634-SI8273BB-IS1R

U2

CAP-019

SOIC8

Cap discharge

DigiKey596-1684-1-ND

U3Si8273BBD -ISR1 2.5kV

SOIC16

ISO Hi/Lo gate driver

Mouser

634-SI8273BB-IS1R

X1

690V

3-pos terminal block

Farnell

3704713X2

5 x MMS-105-01-L-SV RS

180-4953

X3

-

-

-

-

X4

-

-

-

-

X5

-

-

-

-

X6

-

-

-

-

X7

-

-

-

-

X8

-

-

-

-

2-pos terminal block

Farnell

3704701

HS1

Heatsink/Fan assy

Fischer

LAM5 50 12

HS1

Housing – Fan assy

Farnell

2751642

HS1

Crimp – Fan assy

Farnell

2063734

HS1

Crimp – Fan assy

Farnell

2063734

HS1

Crimp – Fan assy

Farnell

2063734

HS1

Crimp – Fan assy

Farnell

2063734

HS1

Insulator 50mm sq

DigiKey345-1548-ND

HS1

M3 x 2.5mm custom
spacerHS1

M3 x 2.5mm custom
spacerHS1

M3 x 2.5mm custom
spacerHS1

M3 x 2.5mm custom
spacerHS1

M3 x 5mm Square nut RS

837-262

HS1

M3 x 5mm Square nut RS

837-262

HS1

M3 x 5mm Square nut RS

837-262

HS1

M3 x 5mm Square nut RS

837-262

HS1

Custom holder
Square nut

HS1

Custom holder
Square nut

HS1

Custom holder
Square nut

X10

UM90024user manual

690V

All information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

24 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

Voltage Package

Description

Supplier

Supplier P/N

HS1

Custom holder
Square nut

HS1

M3 x 12mm Pozi
screw

Farnell

1420391

HS1

M3 x 12mm Pozi
screw

Farnell

1420391

HS1

M3 x 12mm Pozi
screw

Farnell

1420391

HS1

M3 x 12mm Pozi
screw

Farnell

1420391

ST1

M3 x 15mm Standoff

Farnell

1336157

ST2

M3 x 15mm Standoff

Farnell

1336157

ST3

M3 x 15mm Standoff

Farnell

1336157

ST4

M3 x 15mm Standoff

Farnell

1336157

ST5

M3 x 15mm Standoff

Farnell

1336157

ST6

M3 x 15mm Standoff

Farnell

1336157

ST7

M3 x 15mm Standoff

Farnell

1336157

ST8

M3 x 15mm Standoff

Farnell

1336157

ST9

M3 x 15mm Standoff

Farnell

1336157

ST10

M3 x 15mm Standoff

Farnell

1336157

ST1

M3 x 6mm Pozi screw Farnell

1419986

ST2

M3 x 6mm Pozi screw Farnell

1419986

ST3

M3 x 6mm Pozi screw Farnell

1419986

ST4

M3 x 6mm Pozi screw Farnell

1419986

ST5

M3 x 6mm Pozi screw Farnell

1419986

ST6

M3 x 6mm Pozi screw Farnell

1419986

ST7

M3 x 6mm Pozi screw Farnell

1419986

ST8

M3 x 6mm Pozi screw Farnell

1419986

ST9

M3 x 6mm Pozi screw Farnell

1419986

ST10

M3 x 6mm Pozi screw Farnell

1419986

PCB

UM90024user manual

PCBWayAll information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

25 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board

5.6. Daughterboard Bill of Materials
Table 4. Daughterboard Bill of Material
Part
Value
Voltage Package

Description

Supplier

Supplier P/N

C1

1.5n

50V

C0603

Capacitor, Ceramic

Mouser81-GRM1885C1H152JA01

C2

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C3

560n

10V

C0603

Capacitor, Ceramic

DigiKey

399C0603C564K8PAC7867CTND

C4

4.7u

35V

C0603

Capacitor, Ceramic

Mouser

81GRM188R6YA475KE5D

C5

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C6

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C7

22p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser80-C0603C220J1G

C8

1n

50V

C0603

Capacitor, Ceramic

Mouser

603-CC603MRX7R9BB102

C9

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C10

22p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser80-C0603C220J1G

C11

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C12

1n

50V

C0603

Capacitor, Ceramic

Mouser

603-CC603MRX7R9BB102

C13

100p

100V

C0603

Capacitor, Ceramic,
C0G

Mouser581-06031C101K

C14

1n

50V

C0603

Capacitor, Ceramic

Mouser

603-CC603MRX7R9BB102

C15

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C16

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C17

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C18

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C19

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C20

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C21

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C22

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C23

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C24

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C25

220u

16V

SMD

Capacitor, Polymer

Mouser

P124158CT-ND

C26

22u

25V

C1206

Capacitor, Ceramic

Mouser

810-C3216X5R1E226M

C27

22u

25V

C1206

Capacitor, Ceramic

Mouser

810-C3216X5R1E226M

C28

10n

25V

C0603

Capacitor, Ceramic

Mouser

603-CC603KRX7R8BB103

C29

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C30

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C31

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C32

10n

25V

C0603

Capacitor, Ceramic

Mouser

603-CC603KRX7R8BB103

C33

22n

25V

C0603

Capacitor, Ceramic

Mouser

603-CC603KRX7R8BB223

UM90024user manual

All information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

26 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

Voltage Package

Description

Supplier

Supplier P/N

C34

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

C35

10n

1kV

C1206

Capacitor, Ceramic

Mouser581-1206AC103KAT2A

C36

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C37

1n

50V

C0603

Capacitor, Ceramic

Mouser

603-CC603MRX7R9BB102

C38

10n

25V

C0603

Capacitor, Ceramic

Mouser

603-CC603KRX7R8BB103

C39

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C40

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

C41

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C42

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C43

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C44

10u

25V

C0805

Capacitor, Ceramic

Mouser81-GRM21BC71E106KE1L

C45

1u

25V

C0603

Capacitor, Ceramic

Mouser

187-CL10B105KA8NNNC

CMC1

CMC 100uH, 200mA, Mouser
SMD

810-ACT45R1012PTL001

CMC2

CMC 100uH, 200mA, Mouser
SMD

810-ACT45R1012PTL001

D1

PMEG3010EB

30V

SOD-523

Diode, Schottky

Nexperia

PMEG3010EB

D2

BAT54C

30V

SOT-23

Dual diode, Schottky

Nexperia

BAT54C, 215

D3

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D4

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D5

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D6

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D7

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D8

ES1J

600V

DO-214AC

Diode

Mouser

833-ES1J-LTP

D9

PMEG3010EB

30V

SOD-523

Diode, Schottky

Nexperia

PMEG3010EB

D10

PMEG3010EB

30V

SOD-523

Diode, Schottky

Nexperia

PMEG3010EB

D11

PMEG3010EB

30V

SOD-523

Diode, Schottky

Nexperia

PMEG3010EB

FB1

600R

FB0603FerriteMouser

810-MMZ1608B601CTAH0

L1

4.7uH

Inductor

Mouser710-74438323047

Q1

BSH103BKR

30V

SOT-23MOSFET n-chan

Nexperia

BSH103BKR

Q2SSM3J334R

30V

SOT-23MOSFET p-chan

Mouser

757-SSM3J334RLF

Q3

SSM3J334R

30V

SOT-23MOSFET p-chan

Mouser

757-SSM3J334RLF

R1

330R

R0603

Resistor

Mouser

603-AC0603FR-07330RL

R2

33k

R0603

Resistor

Mouser

603-AC0603FR-0733KL

R3

2.61k

R0603

Resistor

Mouser

660-RK73H1JTTD2611F

R4

16k

R0603

Resistor

Mouser

660-RK73H1JTTD1602F

R5

3.57k

R0603

Resistor

Mouser

660-RK73H1JTTD3571F

R6

30k

R0603

Resistor

Mouser

603-AC0603FR-0730KL

R7

1M

R0603

Resistor

Mouser

603-RC0603FR-131ML

R8

5.1k

R0603

Resistor

Mouser

603-AC0603FR-075K1L

R9

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R10

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R11

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R12

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

UM90024user manual

All information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

27 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

R13

470k

R14

Description

Supplier

Supplier P/N

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R15

1.8k

R0603

Resistor

Mouser

279-CRGCQ0603F1K8

R16

61.9k

R0603

Resistor

Mouser

660-RK73H1JTTD6192F

R17

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R18

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R19

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R20

100k

R0603

Resistor

Mouser

660-RK73H1JTTD1003F

R21

1k

R0603

Resistor

DigiKey

RMCF0603FT1K00CT-ND

R22

1M

R0603

Resistor

Mouser

603-RC0603FR-131ML

R23

5.1k

R0603

Resistor

Mouser

603-AC0603FR-075K1L

R24

30k

R0603

Resistor

Mouser

603-AC0603FR-0730KL

R25

40.2k

R0603

Resistor

Mouser

660-RK73H1JTTD4022F

R26

10k

R0603

Resistor

Mouser

603-AC0603FR-0710KL

R27

1.21k

R0603

Resistor

Mouser

660-RK73H1JTTD1211F

R28

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R29

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R30

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R33

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R34

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R35

470k

R1206

Resistor

Mouser

660-RK73H2BTTD4703F

R36

49.9R

R0603

Resistor

Mouser

660-RK73H1JTTD49R9F

R37

100k

R0603

Resistor

Mouser

660-RK73H1JTTD1003F

R39

39.2k

R0603

Resistor

Mouser

660-RK73H1JTTD3922F

R40

49.9R

R0603

Resistor

Mouser

660-RK73H1JTTD49R9F

R41

20k

R0603

Resistor

Mouser

660-RK73H1JTTD2002F

R42

10k

R0603

Resistor

Mouser

603-AC0603FR-0710KL

R43

470R

R0603

Resistor

Mouser

652-CR0603FX-4700ELF

R44

10k

R0603

Resistor

Mouser

603-AC0603FR-0710KL

R45

22.1k

R0603

Resistor

Mouser

660-RK73H1JTTD2212F

R46

48.7k

R0603

Resistor

Mouser

660-RK73H1JTTD4872F

R47

220k

R0603

Resistor

Mouser

660-RK73H1JTTD2203F

R48

12.1k

R0603

Resistor

Mouser

660-RK73H1JTTD1212F

R49

0R

R0603

Resistor

Mouser

603-RC0603FR-070RL

R50

49.9k

R0603

Resistor

Mouser

660-RK73H1JTTD4992F

R51

10k

R0603

Resistor

Mouser

603-AC0603FR-0710KL

R52

1M

R0603

Resistor

Mouser

603-RC0603FR-131ML

R53

24.9k

R0603

Resistor

Mouser

660-RK73H1JTTD2492F

R54

1k

R0603

Resistor

DigiKey

RMCF0603FT1K00CT-ND

R55

61.9k

R0603

Resistor

Mouser

660-RK73H1JTTD6192F

R56

48.7k

R0603

Resistor

Mouser

660-RK73H1JTTD4872F

R57

124k

R0603

Resistor

Mouser

660-RK73H1JTTD1243F

R58

12.1k

R0603

Resistor

Mouser

660-RK73H1JTTD1212F

R59

49.9k

R0603

Resistor

Mouser

660-RK73H1JTTD4992F

UM90024user manual

Voltage Package

All information provided in this document is subject to legal disclaimers.

Rev. 1.0 — 21 November 2023

© Nexperia B.V. 2023. All rights reserved

28 / 40

UM90024

Nexperia

4 kW analogue bridgeless totem-pole PFC evaluation board
Part

Value

R60

1M

R61

Voltage Package

Description

Supplier

Supplier P/N

R0603

Resistor

Mouser

603-RC0603FR-131ML

24.9k

R0603

Resistor

Mouser

660-RK73H1JTTD2492F

R62

1k

R0603

Resistor

DigiKey

RMCF0603FT1K00CT-ND

R63

24.9k

R0603

Resistor

Mouser

660-RK73H1JTTD2492F

R64

39.2k

R0603

Resistor

Mouser

660-RK73H1JTTD3922F

R65

12.1k

R0603

Resistor

Mouser

660-RK73H1JTTD1212F

Flyback Transformer,
TH

Wurth

750314352

T1
U1

SOIC8

Power Factor
Controller

Mouser

595-UCC28180DR

U2

SOIC8

Comparator

Mouser

511-TS393IDT

U3

SOIC8

Op-amp

Mouser

511-TSX712IDT

U4

SOT-23-6

Comparator withshutdown

Mouser

926-LMV761MF

U5

74LV32APWTSSOP-14

Quad 2-input OR gate Nexperia

74LV32APWU6

74LV04PWTSSOP-14

Hex NOT gate

Nexperia

74LV04PWU7

74LV08PWTSSOP-14

Quad 2-input AND
gate

Nexperia

74LV08PW

U874LV08PWTSSOP-14

Quad 2-input AND
gate

Nexperia

74LV08PW

U9Mini-flat

Opto-coupler

Mouser512-FODM8801A

U10

SOT-23Vref adjustable

Mouser

NCP432BISNT1G0SCTND

U11

SOIC16

Offline switcher

Mouser

863-NCP1063AD060R2G

U12

SOIC8

Comparator

Mouser

511-TS393IDT

U13

SOT-23-5

Regulator LDO
adjustable

Mouser497-16672-1-ND

U14

SOT-23-5

Regulator LDO
adjustable

Mouser497-16672-1-ND

X1

TMM-105-01-L-S-RA

Mouser

200-TMM10501LSRA

X2

TMM-105-01-L-S-RA

Mouser

200-TMM10501LSRA

X3

TMM-105-01-L-S-RA

Mouser

200-TMM10501LSRA

X4

TMM-105-01-L-S-RA

Mouser

200-TMM10501LSRA

X5

TMM-105-01-L-S-RA

Mouser

200-TMM10501LSRA

4.7V

SOD-523

Diode, Zener

Nexperia

BZX585-B4V7

Z2

170V

DO-214AC

Diode, TVS
unidirectional

Mouser

625-SMAJ170A-E3

Z3

16V

DO-214AC

Diode, Zener

Mouser

621-SMAZ16-13-F

PCB

PCBWayZ1

BZX585-B4V7

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6. Using the board
The board can be used for evaluation of Nexperia GAN039-650NTB GaN FETs in a bridgelesstotem-pole PFC circuit. It is not a complete circuit, but rather a building block.

6.1. Turn on sequence
1. Insert the daughterboard into the corresponding connectors on the mainboard marked X2 on
the PCB, making sure that all pins are aligned correctly and inserted fully.
2. Connect an electronic/resistive load to the output terminal block marked X10 on the PCB,
making sure that the correct polarity is observed (if applicable).
The requirements for the resistive load are:• at 115 VAC input: between 0 W and ≤2000 W• at 230 VAC input: between 0 W and ≤4000 W
3. With the high voltage power OFF, connect the high-voltage AC power input to the input terminal
block marked X1 on the PCB; L and N (PE: Protective Earth).
4. Turn ON the AC power input (85 VAC to 265 VAC, 50 Hz to 60 Hz):• minimum load power for turn-on sequence is 360 W• monitor X10 output voltage with a VDC meter and verify 385 V ±5 V is generated• load can be increased/decreased when AC supply is ON and board is functional

6.2. Turn off sequence
1. Turn OFF the high-voltage AC power input.
2. Verify input and output voltages are at 0 V.

7. Operational waveforms
Fig. 14 shows the converter start-up procedure with an AC input voltage of 230V and an output
load of 360W: CH1 shows the PWM applied to the gate of low-side GaN FET Q2, CH2 is the DC
bus voltage waveform, CH3 is the voltage waveform of fast leg switching node (SW_NODE) andCH4 is the AC input current.
For the start-up, there are three phases to charge the DC bus to a reference voltage. Initially, therelay K1 contacts are open and the DC bus capacitors are charged by the input voltage through theinrush current limiters R17/R18 and the diode bridge D11. The inrush current limiters R17/R18 anddiode bridge are applied in this circuit to avoid high inrush current flow through the GaN FETs.
When the voltage on VDC_OUT is over 100 V, the relay K1 contacts are closed to bypass theinrush current limiters, and the voltage on VDC_OUT increases to the peak of the input voltage.
After approximately 100 ms following application of the AC input, the GaN FETs are engaged
in closed-loop voltage control, in which the voltage on VDC_OUT slowly increases to the rated
voltage of 385 V.
Fig. 15 below shows the VDS of Q2 during one turn-on event of a five pulse, single-shot staircase
test at 50 kHz. The inductor is connected to the BUS voltage set at 400 V and the current flows
through the low-side GaN FET and recirculates through the high-side GaN FET. Each pulse has awidth of 3.8 μs, leading to a peak inductor current of 36 A. It can be seen that the voltage spike is
19 V at IL = 22 A.
The transient signal seen on VGS when VDS makes it's low-to-high transition may appear to be
an example of Miller feedback. Because of the extremely low Miller capacitance of the casacodeswitch, this is not actually the case. The voltage transient is due to di/dt in the small, but non-zero,source inductance. The internal VGS actually changes very little during the transient, and there is
therefore no concern for false turn-on.

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4 kW analogue bridgeless totem-pole PFC evaluation board

CH1: Q2 PWM; CH2 VO; CH3 SW_NODE; CH4 Iin)
Fig. 14. Start-up of the bridgeless totem-pole PFC with 360 W load

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4 kW analogue bridgeless totem-pole PFC evaluation board

Fig. 15. Waveforms of VGS and VDS of Q2 at IL = 22 A

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4 kW analogue bridgeless totem-pole PFC evaluation board

8. Dead-time control
The required form of the gate-drive signals is shown in Fig. 16. The times marked A are the deadtimes when neither GaN FET is driven on. The dead-time must be greater than zero to avoid shootthrough currents. The dead-times are set by resistors R3 and R5 on the daughterboard – thevalues specified in the Bill of Materials correspond to approximately 200 ns.
VGS 1
VGS 2
A

B

A

Fig. 16. Non-overlapping gate pulses
Nexperia GaN FETs can switch at dV/dt of 50 V/ns or higher to enable the lowest possible
switching loss. At this level of operation, even the layout becomes a significant contributor toperformance. As shown in Fig. 8, the recommended PCB layout keeps a minimum gate drive loop;
it also keeps the traces between the switching nodes very short, with the shortest practical return
trace to the power bus and ground. The power ground plane provides a large cross-sectional area
to achieve an even ground potential throughout the circuit.
For further information, the different layers of the Nexperia Analogue Totem-Pole PFC evaluation
board design are shown in Section 5.2.

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4 kW analogue bridgeless totem-pole PFC evaluation board

9. Probing
As shown in Fig. 17 below, there are probing positions to allow measurement of VGS Fig. 17 (a) andVDS Fig. 17 (b) of the low-side fast switching GaN FET.

(a)

(b)

Fig. 17. VGS and VDS probing positions of low-side fast switching GaN FETAs shown in Fig. 18 below, there is also a probing position to allow measurement of VGS of the lowside slow switching GaN FET.

Fig. 18. VGS probing positions of low-side slow switching GaN FET

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4 kW analogue bridgeless totem-pole PFC evaluation board
As shown in Fig. 19 below, there are also probing positions to allow measurement of high-side VGSof both the fast switching and slow switching GaN FETs. For these signals to be measured during
operation, it is recommended that optical probes, such as Tektronix IsoVu, are utilised.

Fig. 19. VGS probing positions of high-side fast and slow switching GaN FET
By removing the jumpers shown in Fig. 20 below and using a short loop of thick gauge wire for thecurrent probe to be clamped around, the PFC inductor current can also be measured.

Fig. 20. Jumpers to be removed when measuring the inductor current

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4 kW analogue bridgeless totem-pole PFC evaluation board

10. Efficiency sweeps
For the efficiency calculations, the input/output voltages and currents are measured using a power
analyzer to obtain the input/output power values. Efficiency has been measured with either 115
VAC or 230 VAC input and 385 VDC output using a calibrated PPA5530 precision power analyzer
from Newtons 4th. The efficiency results for the totem-Pole PFC board are shown in Fig. 21.
The extremely high efficiency of > 98.8% at 230 VAC input and > 97.6% at 115 VAC input will
enable customers to reach peak system efficiency to meet and exceed Titanium standards.
aaa-037731

99.5
Efficiency
(%)
98.5

97.5

96.5

0

1000

2000

3000

Highline (230 VAC input)

4000
5000
Output power (W)Lowline (115 VAC input)
Fig. 21. Efficiency as a function of output power for bridgeless totem-pole PFC evaluation board

11. Revision history
Table 5. Revision history
Revision
Date
numberDescription

1.0

Initial version.

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2023-11-21

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12. Legal information
Definitions
Draft — The document is a draft version only. The content is still underinternal review and subject to formal approval, which may result in
modifications or additions. Nexperia does not give any representations or
warranties as to the accuracy or completeness of information included hereinand shall have no liability for the consequences of use of such information.

Disclaimers
Limited warranty and liability — Information in this document is believed
to be accurate and reliable. However, Nexperia does not give any
representations or warranties, expressed or implied, as to the accuracy
or completeness of such information and shall have no liability for theconsequences of use of such information. Nexperia takes no responsibility
for the content in this document if provided by an information source outsideof Nexperia.
In no event shall Nexperia be liable for any indirect, incidental, punitive,
special or consequential damages (including - without limitation - lost
profits, lost savings, business interruption, costs related to the removalor replacement of any products or rework charges) whether or not suchdamages are based on tort (including negligence), warranty, breach ofcontract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia’s aggregate and cumulative liability towards customer
for the products described herein shall be limited in accordance with theTerms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make changes
to information published in this document, including without limitation
specifications and product descriptions, at any time and without notice. This
document supersedes and replaces all information supplied prior to the
publication hereof.
Suitability for use — Nexperia products are not designed, authorized or
warranted to be suitable for use in life support, life-critical or safety-criticalsystems or equipment, nor in applications where failure or malfunctionof an Nexperia product can reasonably be expected to result in personal
injury, death or severe property or environmental damage. Nexperia and its
suppliers accept no liability for inclusion and/or use of Nexperia products insuch equipment or applications and therefore such inclusion and/or use is at
the customer’s own risk.
Applications — Applications that are described herein for any of theseproducts are for illustrative purposes only. Nexperia makes no representation
or warranty that such applications will be suitable for the specified use
without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using Nexperia products, and Nexperia accepts no liability forany assistance with applications or customer product design. It is customer’ssole responsibility to determine whether the Nexperia product is suitableand fit for the customer’s applications and products planned, as well as
for the planned application and use of customer’s third party customer(s).
Customers should provide appropriate design and operating safeguards tominimize the risks associated with their applications and products.
Nexperia does not accept any liability related to any default, damage, costs
or problem which is based on any weakness or default in the customer’s
applications or products, or the application or use by customer’s third party
customer(s). Customer is responsible for doing all necessary testing for thecustomer’s applications and products using Nexperia products in order toavoid a default of the applications and the products or of the application or
use by customer’s third party customer(s). Nexperia does not accept any
liability in this respect.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a priorauthorization from competent authorities.
Translations — A non-English (translated) version of a document is forreference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.

Trademarks
Notice: All referenced brands, product names, service names andtrademarks are the property of their respective owners.

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4 kW analogue bridgeless totem-pole PFC evaluation board

List of Tables
Table 1. 4 kW Analogue Totem-pole PFC evaluation
board Input/Output specifications.........................................5
Table 2. GaN FET and equivalent CoolMOS MOSFET
key parameter comparison.................................................. 6
Table 3. Mainboard Bill of Material.................................... 21
Table 4. Daughterboard Bill of Material..............................26
Table 5. Revision history....................................................36

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4 kW analogue bridgeless totem-pole PFC evaluation board

List of Figures
Fig. 1. Example of a safety enclosure in the Nexperia lab... 2
Fig. 2. Example of a probe positioner..................................3
Fig. 3. 4 kW analogue totem-pole PFC evaluation
board; top view with control card and heatsink fitted........... 4
Fig. 4. 4 kW analogue totem-pole PFC evaluation
board; top view of GaN FETs (heatsink removed)............... 4
Fig. 5. Totem-pole bridgeless PFC converter based on
GaN FET.............................................................................. 6
Fig. 6. GaN FET totem-pole bridgeless PFC converter........7
Fig. 7. Hard-switched waveform of a pair of GaN FET
switches................................................................................8
Fig. 8. Mainboard PCB top layer........................................12
Fig. 9. Mainboard PCB bottom layer..................................13
Fig. 10. Mainboard PCB inner layers 2 (ground place)and 3 (power and ground planes)......................................14
Fig. 11. Daughterboard PCB top layer............................... 18
Fig. 12. Daughterboard PCB bottom layer.........................19
Fig. 13. Daughterboard PCB inner layers 2 (groundplace) and 3 (power and ground planes)........................... 20
Fig. 14. Start-up of the bridgeless totem-pole PFC with
360 W load.........................................................................31
Fig. 15. Waveforms of VGS and VDS of Q2 at IL = 22 A... 32
Fig. 16. Non-overlapping gate pulses................................ 33
Fig. 17. VGS and VDS probing positions of low-side
fast switching GaN FET..................................................... 34
Fig. 18. VGS probing positions of low-side slow
switching GaN FET............................................................ 34
Fig. 19. VGS probing positions of high-side fast andslow switching GaN FET....................................................35
Fig. 20. Jumpers to be removed when measuring theinductor current.................................................................. 35
Fig. 21. Efficiency as a function of output power forbridgeless totem-pole PFC evaluation board..................... 36

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4 kW analogue bridgeless totem-pole PFC evaluation board

Contents
1. EVALUATION BOARD TERMS OF USE.......................2
2. High Voltage Safety Precautions.................................2
3. Introduction................................................................... 4
3.1. Warnings......................................................................5
3.2. Quick reference information........................................ 5
4. Circuit description........................................................ 6
5. Design details............................................................... 95.1. Mainboard schematics...............................................10
5.2. Mainboard PCB layout...............................................125.3. Daughterboard schematics........................................ 15
5.4. Daughterboard PCB Layout.......................................18
5.5. Mainboard Bill of Materials........................................ 21
5.6. Daughterboard Bill of Materials................................. 26
6. Using the board.......................................................... 30
6.1. Turn on sequence......................................................30
6.2. Turn off sequence......................................................30
7. Operational waveforms.............................................. 30
8. Dead-time control....................................................... 33
9. Probing........................................................................ 34
10. Efficiency sweeps.....................................................36
11. Revision history........................................................ 36
12. Legal information......................................................37© Nexperia B.V. 2023. All rights reserved

For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release: 21 November 2023

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