TIDT256A March   2022  – March 2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 LM5156-Q1
      1. 1.1.1 Loading LM5156-Q1
      2. 1.1.2 LM5156-Q1 SEPIC Bode Loop Testing
    2. 1.2 Loading UCC14240-Q1
    3. 1.3 UCC5870-Q1 and UCC5870-Q1 EVM GUI
    4. 1.4 Voltage and Current Requirements
    5. 1.5 Required Equipment
    6. 1.6 Considerations
    7. 1.7 Dimensions
  5. 2Testing and Results
    1. 2.1 SEPIC Efficiency Graphs
    2. 2.2 SEPIC Efficiency Data
    3. 2.3 SEPIC Bode Plots
    4. 2.4 Thermal Images
  6. 3Waveforms
    1. 3.1 SEPIC Switching
    2. 3.2 SEPIC Output Voltage Ripple
    3. 3.3 SEPIC Load Transients
    4. 3.4 SEPIC Start-Up Sequence
    5. 3.5 Isolated Bias Supply Start Up and Shutdown
    6. 3.6 Isolated Gate Drive

Description

This reference design provides isolated bias supply and isolated gate drivers for power switches in traction inverters and onboard chargers. Both the bias power and driver provide the high isolation (3-kVRMS for 1 minute) needed for 800-VDC bus applications. The isolated bias provides from 24 VDC both the +15-V and –5-V gate drive biases. The isolated driver provides the high currents (up to 30-A peak) needed to rapidly turn on and off these high-power switches, and offers advanced protection features. This reference design also provides a tested DC/DC single-ended primary inductor converter SEPIC off automotive battery voltage (6 V to 42 V, including surges and dips) to provide the regulated 24 V.