Two output flyback power supply reference design for EV motor/generator inverter applications
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Key Document


This flyback converter reference design supplies a non-isolated 5-V/0.25-A regulated output and an isolated 10-V/1.5-A unregulated output voltage. It uses primary-side regulation to reduce component count and operates over a wide automotive input voltage range of 5 V to 40 V. 

  • Primary-side regulation reduces component count and eliminates need for an opto-coupler
  • Excellent 10-V output voltage regulation over full input range with typical loads
  • Efficiency greater than 81% from 12-V input with typical loads
  • Compact size (78 mm x 48 mm) minimizes required PCB area

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(Output Voltage 1)
(Output Voltage 2)
Vin (Min) (V)557
Vin (Max) (V)4040
Vout (Nom) (V)510
Iout (Max) (A).251.5
Output Power (W)1.2515
Input TypeDCDC
TopologyFlyback- CCMFlyback- CCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5155-Q1  2.2MHz wide VIN non-synchronous boost/SEPIC/flyback controller  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS7B82-Q1  Automotive 300-mA, off-battery (40-V), ultra-low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5155-Q1 Download Download
TPS7B82-Q1 Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4420 25 Oct 2019
Design files (6)
Title Type Size (KB) Date
ZIP 440 25 Oct 2019
ZIP 33825 25 Oct 2019
PDF 559 25 Oct 2019
PDF 94 25 Oct 2019
PDF 103 25 Oct 2019
PDF 138 25 Oct 2019

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