Inverting SEPIC reference design for noise sensitive loads
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Key Document


This reference design is an inverting SEPIC (Cuk) Converter powering 50-W continuous and up to 70-W peak. The used Cuk topology provides continuous currents at input and output, which allows the lowest conducted emissions in both directions.  Compared to an inverting flyback radiated emissions are low as well due to no RF ringing at the switch node.

  • Best EMI behavior compared to inverting buck boost or inverting flyback
  • A high full load efficiency of 94%
  • Transient response is better than 1% for 50% load range
  • Output voltage is regulated very tight over the whole input voltage range (28 V to 42 V)
  • Load regulation is tight over the whole output current range
  • UVLO functionality is integrated

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(Output Voltage 1)
Vin (Min) (V)28
Vin (Max) (V)42
Vout (Nom) (V)-36
Iout (Max) (A)2
Output Power (W)72
Input TypeDC

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5022  6-60V Wide Vin, current mode boost, SEPIC and Flyback controller  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TLV271  Single 16V, 3MHz, 550-uA/ch, rail-to-rail output op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5022 Download Download
TLV271 Download Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 3967 07 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 23 07 Dec 2018
ZIP 553 07 Dec 2018
PDF 467 07 Dec 2018
PDF 96 07 Dec 2018
PDF 158 07 Dec 2018
PDF 107 07 Dec 2018

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