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onsemi andand other names, marks, and brands are registered and/or common law trademarks of Semiconductor Components Industries, LLC dba “onsemi” or its affiliates and/orsubsidiaries in the United States and/or other countries. onsemi owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of onsemi
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by customer’s technical experts. onsemi does not convey any license under any of its intellectual property rights nor the rights of others. onsemi products are not designed, intended, or authorized
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100 W Automotive
Pre-Regulator, Non-Isolated,
Synchronous Buck,
NCV881930-Based
Reference Designwww.onsemi.com

TND6290/D

REFERENCE DESIGN

Overview

This reference design describes the operation and the performanceof a 100 W non−isolated synchronous buck automotive pre−regulator,
based on the NCV881930 synchronous buck controller with four
NVMFS5C460NL 40 V N−channel MOSFET. The reference designshows a complete design for an automotive pre−regulator for a broad
range of applications, and highlights the capabilities of theNCV881930 controller.
It is intended for the power supply designer to adopt the circuit
directly into a typical system design, making only minimal component
changes based on the system requirements.
The design is meant to be a complete solution, but it also provides
access to key features of the NCV881930. These include integrated
compensation, low IQ and continuous synchronous mode, wide input
range, overcurrent protection, external synchronization, adaptive
non−overlap drivers, integrated spread−spectrum, and under voltage
lockout.
Key Features• Complete Automotive Reference Design• Synchronous Buck Converter with an Input Voltage Range between
6.0 to 16.0 V, Handles Peaks Up to 40 V

• 410 kHz Switching Frequency for Maximum Efficiency• NCV881930 Low Quiescent Current Automotive Synchronous Buck
Converter and Four NVMFS5C460NL 40 V N−channel MOSFET• Small Form Factor PCB with Four Layers

Figure 1. Reference Design
Board Image

Specifications
Table 1. SPECIFICATIONS TABLE
Device

NCV881930

Application

Automotive Pre-Regulator

Input Voltage

6 V to 16 V DC, 40 V Peak

Output Power

Up to 100 W

Topology

Synchronous Buck

Isolation

Non-Isolated

Output Voltage

5.0 V

Nominal Current

15.0 A
20.0 A (Peak)© Semiconductor Components Industries, LLC, 2019

October, 2020 − Rev. 2

1

Publication Order Number:
TND6290/D

TND6290/D
SCHEMATICS

Figure 2. NCV881930 Synchronous Buck Schematic

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TND6290/D
BOARD LAYOUT(length × width) where the height of the PCB isapproximately 12.5 mm.

Figure 3, 4, 5 and 6 shows the top and bottom assembly
and the four layers of the PCB. The PCB is 47 mm × 100 mm

Figure 3. Top Layer and Assembly Drawing

Figure 4. Bottom Layer and Assembly Drawing

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TND6290/D

Figure 5. Inner Top Layer

Figure 6. Inner Bottom Layer

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TND6290/D
PERFORMANCE SUMMARY
Output Voltage

be necessary. Therefore please refer to Table 6 in thedatasheet.

NCV881930 has two fixed output voltage options, 3.3 V
and 5.0 V. By pulling VSEL pin to DBIAS using a 10 kW
resistor, the output voltage is set to 5.0 V. Leaving VSEL
floating or connecting it to GND, sets the output voltage to3.3 V.
Depending on the output current, a modification of thepower stage (inductor, shunt, and output capacitance) might

Efficiency

The efficiency for continuous synchronous mode isshown in Figure 7. This measurement does take into accountthe losses in the input filter (inductor L1).

Figure 7. Efficiency for 8.0, 12.0 and 16.0 V Input Voltage

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TND6290/D
Thermal Image

The thermal images show the board at an ambient
temperature of 21°C with an input voltage of 12.0 V, 10.0 A(Figure 8) and 15.0 A (Figure 9) load.
Component

VIN = 12.0 V @ 10.0 A

VIN = 12.0 V @ 15.0 A

Controller

51.2°C

61.0°C

Upper FETs

74.4°C

87.4°C

Lower FETs

66.7°C

85.3°C

Inductor

58.0°C

80.5°C

Figure 9. Thermal Image at 15.0 A Load

Figure 8. Thermal Image at 10.0 A Loadwww.onsemi.com
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TND6290/D
Transient Response

The response to a load step from 10.0 A to 20.0 A and viceversa at 12.0 V input voltage is shown in Figure 10.
Channel 1♦ Output voltage, −147 mV (−2.94%) undershoot,+147 mV (+2.94%) overshoot♦ 100 mV/div, 100 ms/div, AC coupled

Channel 2♦ Output current, load step 20.0 to 10.0 A and viceversa
♦ 10 A/div, 100 ms/div

Figure 10. Transient Response on 20.0 A to 10.0 A Load Step Down and 10.0 A to 20.0 A Load Step Up

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TND6290/DFrequency Response

The frequency response at 12.0 V input voltage and10.0 A and 20.0 A load is shown in Figure 11 and Figure 12.
FREQUENCY RESPONSE
Input Voltage

Output Current

Bandwidth

Phase Margin

Gain Margin

12.0 V

10.0 A

39.2 kHz

90.1°−17.2 dB

12.0 V

20.0 A

38.1 kHz

92.8°−15.3 dB

Figure 11. Frequency Response at 10.0 A LoadFigure 12. Frequency Response at 20.0 A Loadwww.onsemi.com
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TND6290/D• 1x 100 nF, 50 V, 0603, X7R, always populated

Impact of Output Capacitance Configuration onPerformance

muRata GCJ188R71H104KA12D• 22 mF ceramic, 16 V, 1210, X7R
muRata GCM32ER71C226ME19L
18 mF @ 5.0 Vdc, 2 mW ESR @ 410 kHz• 120 mF polymer
Nichicon PCJ0J121MCL1GS
24 mW ESR @ 100 kHz• 220 mF polymer
Nichicon PCJ0J221MCL1GS
15 mW ESR @ 100 kHz

The datasheet of the NCV881930 gives detailed
recommendations for the output filter configuration(inductance, shunt resistance, and output capacitance)
dependent on the output voltage and current.
Table 2 shows the measurement results for various output
capacitor configurations and their corresponding
performance regarding ripple, transient response and phasemargin.
Different sets of high capacitance ceramic and polymer
capacitors were used for the measurements.

Table 2. MEASUREMENT RESULTS FOR VARIOUS OUTPUT CAPACITOR CONFIGURATIONSPolymer: 220 mF, 6.3 V210

# of caps

Polymer: 120 mF, 6.3V003# of capsCeramic: 22 mF, 16 V

111

# of caps

Output Ripple, peak−peak

145

162

96

[mV]

Output Ripple, peak−peak

2.90

3.24

1.92

[%]

Transient Response, peak−peak±147−183 / +157

−153 / +137

[mV]Transient Response, peak−peak

2.94

3.66 / 3.14

3.06 / 2.74[%]

Bandwidth

38.1

66.6

34.5

[kHz]

Phase Margin

92.8

69.4

80.3

[°]

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BILL OF MATERIALS (BOM)
Table 3. BILL OF MATERIALS
DesignatorQty.

Value

Part Number

Manufacturer

Description

Package

C2, C3, C4,C8, C954.7 mF

GCJ32ER71H475KA12

MuRataCAP, CERM, 4.7 mF,
50 V, ±10%, X7R, 1210

1210

C6, C7, C11,
C12, C16,
C21, C22,
C25

80.1 mF

GCJ188R71H104KA12

MuRataCAP, CERM, 0.1 mF,
50 V, ±10%, X7R,
AEC−Q200 Grade 1,0603

0603

C101

270 mF

GYA1V271MCQ1GS

Nichicon

CAP, Conductive
Polymer Hybrid
Aluminum Electrolytic,
270 mF, 35 V, ±20%,0.020 W, 10x10.3 SMD

10.3x10.3x10.3

C13, C172220 mF

PCJ0J221MCL1GS

Nichicon

CAP, Conductive
Polymer Aluminum
Capacitor 220 mF,6.3 V, ±20%, 0.015 W,
AEC−Q200 Grade 2,SMD

D6.3xL6.W

C15

122 mF

GCM32ER71C226KE19L

MuRataCAP, CERM, 22 mF, 16 V,±10%, X7R, 1210

1210

C18, C23,
C24, C26

41 mF

GCJ188R71E105KA01D

MuRataCAP, CERM, 1 mF, 25 V,±10%, X7R, AEC−Q200
Grade 1, 0603

0603

C20

1100 pF

GRM1885C1H101JA01D

MuRataCAP, CERM, 100 pF,
50 V, ±5%, C0G/NP0,0603

0603

D1

140 V

NRVBAF440T3G

ON Semiconductor

Diode, Schottky, 40 V,
4 A, SMA−FLSMA−FL

FID1, FID2,FID3, FID44N/A

N/A

Fiducial mark. There isnothing to buy or mount.

N/A

J1, J42ED120/2DS

On−Shore
Technology

Terminal Block, 5.08 mm,2x1, Brass, TH

2x1 5.08 mm
Terminal Block

J2, J3261300311121

Wurth Elektronik

Header, 2.54 mm, 3x1,Gold, TH

Header,2.54 mm,3x1, TH

L1

1

1.5 mH

XAL7030−102MEB

CoilcraftInductor, Shielded,
Composite, 1 mH, 21.8 A,0.00455 W, SMD

XAL7030

L2

11.3 mH

XAL1580−132MEB

CoilcraftInductor, Shielded,
Composite, 1.3 mH, 46.7
A, 0.00115 W, SMD

15.2x8x16.2mm

Q1, Q2, Q3,
Q4440

NVMFS5C460NLAFT1G

ON Semiconductor

MOSFET, N−CH, 40 V,
78 A, DFN5 5x6 mm

DFN5 5x6 mm

R1, R2, R8,
R9, R13,R1560

CRCW06030000Z0EA

Vishay−Dale

RES, 0, 5%, 0.1 W, 0603

0603

R3, R520.003

ERJ−M1WTF3M0U

Panasonic

RES, 0.003, 1%, 1 W,
2512

2512

R410

CRCW25120000Z0EG

Vishay−Dale

RES, 0, 5%, 1 W,
AEC−Q200 Grade 0,2512

2512

R711.00

CRCW06031R00FKEA

Vishay−Dale

RES, 1.00, 1%, 0.1 W,
0603

0603

R10, R122332

CRCW0603332RFKEA

Vishay−Dale

RES, 332, 1%, 0.1 W,
0603

0603

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TND6290/D
Table 3. BILL OF MATERIALS (continued)
Designator

Qty.

Value

Part Number

Manufacturer

Description

PackageR11, R14

210.0kCRCW060310K0FKEA

Vishay−Dale

RES, 10.0 k, 1%, 0.1 W,
0603

0603

TP1, TP325000

Keystone

Test Point, Miniature,
Red, TH

Red Miniature
Testpoint

TP2, TP6,TP1135001

Keystone

Test Point, Miniature,
Black, THBlack Miniature
Testpoint

TP7, TP8,TP9, TP10

45002

Keystone

Test Point, Miniature,White, TH

White Miniature
Testpoint

U1

1

NCV881930MW00R2G

ON Semiconductor

Low Quiescent Current
410 kHz Automotive
Synchronous BuckController

QFNW−24

ON Semiconductor andare trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/orspecifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are notdesigned, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, andexpenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if suchclaim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.

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