4.5-V to 65-V input, compact bias supply with power stage reference design for IGBT/SiC gate drivers
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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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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5180-Q1  Automotive 65-VIN PSR flyback converter with 100-V, 1.5-A integrated power MOSFET  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM74700-Q1  3.2-V to 65-V, 80-uA IQ automotive ideal diode controller  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS3700-Q1  Automotive high-voltage (18-V) window voltage detector for overvoltage and undervoltage monitoring  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5180-Q1 Download Download
LM74700-Q1 Download -
TPS3700-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3063 03 Apr 2019
Design files (7)
Title Type Size (KB) Date
ZIP 390 03 Apr 2019
ZIP 709 03 Apr 2019
PDF 615 03 Apr 2019
PDF 143 03 Apr 2019
PDF 53 03 Apr 2019
PDF 177 03 Apr 2019
ZIP 2645 03 Apr 2019
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Reference Designs (3)

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