Isolated IGBT Gate-Drive Push-Pull Power Supply with 4 Outputs
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This reference design provides isolated positive and negative voltage rails required for Insulated Gate Bipolar Transistor (IGBT) gate drivers from a single 24-volt DC input supply. IGBTs are used in three phase inverters for variable-frequency drives to control the speed of AC motors. This reference design uses a push-pull isolated control topology and provides isolation compliant to IEC61800-5 and is intended to operate from a pre-regulated 24Vdc input.

With a regulated (within 5%) input source, a simple open-loop, free-running oscillator can be implemented with a push-pull PWM controller. This topology is essentially a forward converter with two primary windings used to create a dual-drive winding. This fully utilizes the transformer core's magnetizing current more efficiently than flyback or the forward topologies. Another advantage this configuration has over flyback and forward configurations is that the supply output can be scaled up for higher power drives.

This reference design also takes advantage of another benefit of the push pull topology in that multiple transformers can be controlled in parallel from a single controller to generate all the isolated voltage rails required for 3-phase IGBT inverters.

Lastly, larger IGBTs for higher power drives sometimes require more gate drive current than what is provided by a typical IGBT gate driver, for which designers often use additional transistors for gate current boosting. This reference design provides +16V on the positive outputs and -8V on the negative outputs to compensate for the added voltage drop in those transistors.

  • Supports 6 IGBT Gate Drivers for 3 arms of inverter (Each arm in half-bridge configuration)
  • Push-pull topology enables parallel transformer stages from a single controller for 3-phase power
  • Operates with pre-regulated 24V input
  • Two reinforced isolated, low-ripple (<200mV) outputs for each IGBT: +16V (x2) & -8V (x2)
  • Output power: 2W per IGBT and scalable to support higher power IGBTs   
  • Option to shut down the power supply to facilitate Safe Torque Off (STO) feature
  • Output capacitors rated to support up to 6A peak gate drive current
  • Designed to meet IEC61800-5

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TI Devices (4)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5030  100-V push-pull current mode PWM controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LP2954A  250-mA, 30-V, low-dropout voltage regulator with high-accuracy  Power management  Sample & Buy Not Available
TPS27082L  8-V, 3-A, 44-mΩ load switch with adj. rise time and hysteresis  Power switches  Not Available Not Available
TPS7A30  200-mA, low-noise, high-PSRR, negative, adjustable low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5030 Download Download
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LP2954A Download Download
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TPS27082L Download Download
TPS7A30 Download Download

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Technical documentation

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Application note (2)
Title Type Size (KB) Date
PDF 7246 06 Jul 2015
PDF 115 12 Mar 2015
User guide (1)
Title Type Size (KB) Date
PDF 6637 20 Jun 2016
White paper (1)
Title Type Size (KB) Date
PDF 743 01 Oct 2019
Design files (5)
Title Type Size (KB) Date
PDF 220 20 Jun 2014
ZIP 2851 19 Jun 2014
ZIP 1692 19 Jun 2014
ZIP 283 19 Jun 2014
PDF 380 19 Jun 2014
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Reference Designs (2)

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