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user manual

NXF6505A-Q100 Low noise, 1.2 A transformer
driver for isolated power supplies evaluation boardAbstract:

This user manual describes the NXF6505A-Q100 Nexperia evaluation board (EVB). The
NXF6505A-Q100 is a specialized push-pull transformer driver that is designed to deliver isolated powerwith low noise and low EMI for isolated power supplies in small form factors. This document contains theEVB schematics, configuration, bill of materials (BOM), EVB top layer, and EVB bottom layer.

Keywords:

NXF6505A-Q100 evaluation board, isolated powerUM90034

Nexperia

NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

1. Introduction
This evaluation board (EVB) is designed for NXF6505A-Q100 devices. Fig. 1 shows the 3D viewof the EVB. The EVB can provide the isolated power supply with one positive output voltage. For
easy evaluation of this EVB, the test points are added to measure the circuitry voltages. The EVB
is designed for the evaluation of device operating parameters only. The parameters include theinput and output voltages, the switching rise and fall times, and break-before-make time (tb-m).

NOTEThe Evaluation Board (EVB) is only intended for evaluating the device parameters.
The EVB is not intended for use with high voltages. There is no active protection
againt high-voltage shock to users and equipment.
Take appropriate precautions against electric shock.

a) EVB 3D top viewb) EVB 3D bottom viewFig. 1.

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NXF6505A-Q100 EVB 3D view

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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

2. Features
The following features are available on this EVB:••

Input voltage range: VCC = 2.25 V to 5.5 VMaximum output current:• NXF6505A-Q100: 1.2 A 1•••

Enable pin
External clock pin
Fail safe input

3. Applications
The EVB design can be used in many applications, including the following:••••••Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I²C, low-power LAN
Process control
Telecom supplies
Radio supplies
Distributed supplies
Isolated power supplies for automotive• Traction inverter and motor control• DC/DC converter• Battery management system (BMS)• On-board charger (OBC)

1 The transformer on the EVB is limited to 1.0 A maximum output current. This transformer can beremoved and replaced for different output voltages and currents.
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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

4. SchematicFig. 2.

NXF6505A-Q100 EVB schematic

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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

5. General configuration and description
This section describes the connectors and test points on the EVB, and how to properly connect,
setup and use the NXF6505A-Q100 EVB.

5.1. Physical access
Table 1 lists the NXF6505A-Q100 EVB connectors functionality, and Table 2 describes theNXF6505A-Q100 EVB test point availability.
Table 1. NXF6505A-Q100 EVB connectors
Connector
Label
Description
J1 Pin1Vin

Power input pin for this board

J1 Pin2GND

Power ground pin for this boardJ2 Pin1

Vout

Isolated power output pin

J2 Pin2

GND2

Isolated power output ground pin

J3

Vin/EN/GND

NXF6505A-Q100 enable or disable pin

J4

CLK/GND

NXF6505A-Q100 external clock pin

Table 2. NXF6505A-Q100 EVB test points
Test point
Label
Description

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TP1VinPower input

TP2GNDPower input ground

TP3

GND

Power input ground

TP4

GND

Power input ground

TP5Vout

Power output

TP6

D2

NXF6505A-Q100 input of pin D2

TP7T1_Pin6

Transformer output of pin 6TP8ENNXF6505A-Q100 input of pin EN

TP9D1

NXF6505A-Q100 input of pin D1

TP10T1_Pin4Transformer output of pin 4

TP11GND2Power output ground

TP12GND2Power output ground

TP13CLKNXF6505A-Q100 external clock pin

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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

5.2. Test setup and procedure

WARNINGRISK OF SERIOUS INJURY OR DEATH DUE TO ELECTRIC SHOCK
Do not connect more than 50 V to this evaluation board, and follow all safety
precautions in documents provided by Nexperia.
Failure to take appropriate precautions against could result in serious injury
or death due to electric shock.
Fig. 3 shows a typical setup for NXF6505A-Q100 EVB. The operational test procedures for thisEVB are available below:
1.
2.
3.
4.

Connect the enable jumper SJ1 to J3 pin 1 and pin 2.
Use wires to connect the Vin and GND to a 5 V power supply through the header J1.
Connect a load using header J2.
Measure the isolated output voltage across TP5 and TP12, expecting around 5 V.

You can use a transformer with an alternative turns ratio to produce a different output voltage.
Kindly refer to the NXF6505A-Q100 data sheet for a selection of recommended transformers
featuring diverse turns ratios.

Fig. 3.

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Test setup

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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

5.3. External clock function
The NXF6505A-Q100 supports an external clock with a frequency range from 100 kHz to 600 kHz.
The maximum input logic high voltage (VIH) is 0.7 × VCC and the minimum input logic low voltage(VIL) is 0.3 × VCC. The external clock frequency is halved by the internal circuitry to control theswitching on pin D1 and pin D2 of the NXF6505A-Q100. Below are the procedures of using theexternal clock.
1. Connect the CLK and GND pins to an external clock source via header J4 or TP13 and TP4.
2. Activate the external clock source to enable the function.
For more detail about the external clock, you can refer to the data sheet of NXF6505A-Q100.

6. Board layout
Fig. 4 shows the top layer of NXF6505A-Q100 EVB, and Fig. 5 shows the bottom layer of
NXF6505A-Q100 EVB.

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NXF6505A-Q100 EVB top layer

Fig. 5.

NXF6505A-Q100 EVB bottom layer

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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation board

7. NXF6505A-Q100 EVB Bill of Materials (BOM)
Table 3. Bill of Materials (BOM)
Designator
Description

Part number

Quantity Manufacturer

H1, H2, H3, H4

Bumpers, Hemisphere, Transparent polyurethane,Adhesive mount, 6.4 mm x 1.9 mm

SJ5382

4C1, C4, C7Multilayer Ceramic Capacitor, 10 µF, 25 V, ±10%,
X7R, 1206

GRM31CR71E106KA12L 3

MurataC2, C5Multilayer Ceramic Capacitor, 1 µF, 25 V, ±10%,
X7R, 0805

CC0805KFX7R8BB105

2YageoC3, C6

Multilayer Ceramic Capacitor, 0.1 µF, 25 V, ± 10%,
X7R, 0603 (1608 Metric)

CC0603KRX7R8BB104

2YageoD1, D2

Diode Schottky, 30 V, 2 A, Forward voltage 310
mV, CFP5(SOD128)

PMEG3020EP

2Nexperia

J1, J2, J4

Header, Pitch 2.54 mm, 2 POS, Single row, SMT

87898-0204

3MolexJ3Header, Pitch 2.54 mm, 3 POS, Single row, SMT

87898-0306

1Molex

SJ1

2 Position 2.54 mm Centerline Single Circuit Open QPC02SXGN-RC
Top Jumper

1Sullins

T1

Push-Pull Transformer, Turns ratio 1:1.1, 5 V,
1 A, 5000 V RMS, 150 kHz, LxWxH 12.32 mm x10.41 mm x 11.18 mm, SMD/SMT

750315240

1WurthElectronics

5019

13

Keystone
Electronics

1Nexperia

TP1, TP2, TP3, Test Point, Mini, SMT, Phos Bronze/Silver, Tape &TP4, TP5, TP6, Reel, Keystone Electronics 5019
TP7, TP8, TP9,TP10, TP11,TP12, TP13U1

NXF6505A-Q100, 160 kHz, 5 V, 1.2 A, External
NXF6505ADA-Q100
clock, Enable, Low-Noise, 1.2 A transformer driverfor isolated power supplies

3M

8. Revision history
Table 4. Revision history
Revision
Date
numberDescription

UM90034 v.1

Initial version

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20240702

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9. 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 - lostprofits, 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 thepublication hereof.
Suitability for use — Nexperia products are not designed, authorized orwarranted 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 atthe 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’sapplications 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 discrepancybetween 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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NXF6505A-Q100 Low noise, 1.2 A transformer driver for isolated power supplies evaluation boardContents
1. Introduction................................................................... 2
2. Features.........................................................................33. Applications.................................................................. 3
4. Schematic......................................................................45. General configuration and description.......................55.1. Physical access........................................................... 55.2. Test setup and procedure............................................65.3. External clock function.................................................7
6. Board layout..................................................................7
7. NXF6505A-Q100 EVB Bill of Materials (BOM).............88. Revision history............................................................89. Legal information......................................................... 9© Nexperia B.V. 2024. 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: 2 July 2024

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