Compact isolated DC/DC flyback reference design
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Key Document


This reference design uses LM5022-Q1 to make an isolated 3.3-V output capable of 1.1-A from a 9-V to 15-V input. All components are placed on one side of the board to reduce assembly complexity and cost. A secondary filter reduces the output ripple to under 30-mV peak-to-peak. The design can achieve 80% efficiency across input conditions.

  • Less than 1% voltage ripple on output
  • 80% efficiency across input voltage range
  • Compact board design with top side only assembly
  • 1.5-kV AC RMS isolation

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Design Files

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(Output Voltage 1)
Vin (Min) (V)9
Vin (Max) (V)15
Vout (Nom) (V)3.3
Iout (Max) (A)1.1
Output Power (W)3.63
Input TypeDC
TopologyFlyback- CCM

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL431LI  Low-IQ programmable shunt regulator offered in an ultra-small DQN package  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM5022-Q1  6-60V Wide Vin, current mode boost, SEPIC and Flyback controller, AEC-Q100 qualified  Step-up (boost) regulators  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ATL431LI Download Download
Download Download
LM5022-Q1 Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1542 10 Jun 2019
Design files (6)
Title Type Size (KB) Date
PDF 118 24 Jun 2019
PDF 285 24 Jun 2019
ZIP 539 10 Jun 2019
ZIP 3191 10 Jun 2019
PDF 439 10 Jun 2019
PDF 76 10 Jun 2019

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