4.5-V to 65-V input, compact bias supply with power stage reference design for IGBT/SiC gate drivers


Design files


This reference design is a 4.2-W, single-channel, automotive 12-V battery input flyback bias supply for IGBT/SiC isolated gate drivers. The supply accepts a wide input range of 4.5-V to 65-V DC. The output is configurable as +15 V,–8 V or +20 V, –4 V at loads up to 180 mA for driving the IGBT/SiC MOSFET power modules. The system consists of reverse polarity protection, electric transients clamping, and overvoltage and undervoltage protection circuits. The flyback controller implements primary-side regulation with better than ±1% load and line regulation performance. The power stage design includes the dual-channel isolated gate drivers with 5.7-kVRMS reinforced isolation and designed in compact form factor of 100 mm × 62 mm. It includes isolated DC bus sensing, isolated temp sensing, logic shoot-through protection and diagnostic features.

  • Wide-VIN flyback converter over the input voltage of 4.5-V to 65-V DC
  • Protection for clamping high voltage conducted transients to safe levels for downstream circuitry
  • Programmable overvoltage and undervoltage protection on supply output
  • Primary side regulation with no optocoupler for extended life time and small form factor
  • Power stage design includes dual channel isolated gate driver, DC bus sensing, and temp sensing for high voltage testing
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

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Design files

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TIDUEO8.PDF (3063 K)

Reference design overview and verified performance test data


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TIDRZG0.ZIP (2645 K)

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Technical documentation

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Type Title Date
* Design guide 4.5-V to 65-V Input, Compact Bias Supply W/ Power Stage Ref. Des. for IGBT/SiC Apr. 03, 2019

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