TIDT296 September   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Cross Regulation
    3. 2.3 Thermal Images
  6. 3Waveforms
    1. 3.1 Start-Up
    2. 3.2 Undervoltage Protection
    3. 3.3 Output Voltage Ripple
    4. 3.4 Load Transients
    5. 3.5 Switching Node Waveforms
    6. 3.6 Short-Circuit Test
    7. 3.7 Diode Voltage Stress

Description

The reference design is a compact size, dual-channel output isolated gate driver board design for IGBT in solar inverter, PCS, as well as UPS and motor driver applications. The isolated bias power is implemented with fly-buck topology using the TPS54308 synchronous buck converter. This converter provides primary-side regulation without the need of optocoupler feedback and offers good output voltage regulation with certain input voltage variation versus the open-loop control method. The design takes 12-V input voltage and generates a non-isolated 5-V rail for primary-side MCU and two isolated outputs with 1500-V function isolation. Each output channel was split to 15-V and –8-V rail and biases each UCC23513 isolated gate driver. The total maximum power for each channel is 2 W. The design is a single-layer PCB board for easy manufacturing.