Automotive Isolated 15V/4.5W Bias Power Supply Reference Design
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Key Document


This reference design displays a power supply solution to generate an isolated 15V rail with a maximum load current of 300mA from an input voltage between 8V and 28V. It also contains an optional Buck converter on the secondary side to provide a 5V rail with 200mA load current for a microcontroller.

  • Built and tested
  • Isolated
  • Primary side regulation, no optocoupler
  • Good load regulation

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)813
Vin (Max) (V)2817
Vout (Nom) (V)155
Iout (Max) (A).3.2
Output Power (W)4.51
Input TypeDCDC
TopologyFlybuckBuck- Synchronous

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5160-Q1  Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
TPS62170-Q1  3-17V 0.5A Automotive Step-Down Converter in 2x2 QFN package  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5160-Q1 Download Download
TPS62170-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 714 25 Jul 2017
Design files (6)
Title Type Size (KB) Date
ZIP 24 25 Jul 2017
ZIP 460 25 Jul 2017
PDF 92 25 Jul 2017
PDF 57 25 Jul 2017
PDF 96 25 Jul 2017
PDF 98 25 Jul 2017

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