Safety isolated secondary SiC MOSFET driver reference design
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Key Document


This reference design provides an integrated high and low side isolated secondary gate driver solution for an automotive battery charging system incorporating two push-pull SN6505B transformer drivers and the isolated dual-channel gate driver UCC21521C.

  • Split rail +15-V / -4-V output
  • Negative 4-V output for fast FET turn off
  • Small 1.500" x 1.750" board dimensions
  • High FET drive current up to 120 mA allows for lower switching losses

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)4.85
Vin (Max) (V)5.15
Vout (Nom) (V)19
Iout (Max) (A).12
Output Power (W)2.28
Input TypeDC
TopologyForward- Push Pull

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
SN6505B  Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies  Power for signal isolators  Sample & Buy View Design Kits & Evaluation Modules
UCC21530-Q1  Automotive, 4-A, 6-A, 5.7-kVrms isolated dual-channel gate driver with enable   Gate drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
SN6505B Download Download
UCC21530-Q1 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1132 25 Apr 2019
Design files (6)
Title Type Size (KB) Date
PDF 150 25 Feb 2019
ZIP 592 25 Feb 2019
PDF 94 25 Feb 2019
ZIP 1795 19 Nov 2018
PDF 472 19 Nov 2018
PDF 110 19 Nov 2018

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