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  • Multiple Output Isolated SiC Driver Bias Supply Reference Design for Onboard Charger Applications

    • TIDT254 January   2022

       

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  • Multiple Output Isolated SiC Driver Bias Supply Reference Design for Onboard Charger Applications
  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Load Regulation
    4. 2.4 Voltage Regulation
    5. 2.5 Thermal Images
  6. 3Waveforms
    1. 3.1 Switching
    2. 3.2 Output Voltage Ripple
    3. 3.3 Short-Circuit Protection
    4. 3.4 Load Transients
    5. 3.5 Start-up Sequence
    6. 3.6 Undervoltage Protection
  7. IMPORTANT NOTICE
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TEST REPORT

Multiple Output Isolated SiC Driver Bias Supply Reference Design for Onboard Charger Applications

Description

This reference design is an open-loop LLC converter, which provides four 18 V and 2.5 V outputs, up to 2.4 W for onboard charger applications. The UCC25800-Q1 device is used here as the controller. The LLC topology allows the transformer to have significant leakage inductance, but a much smaller primary-secondary capacitance, which significantly reduces common-mode current injection through the bias transformer.

Features

  • Small size, open-loop LLC
  • Reinforced insulation
  • Compact PCB size (55 mm × 45 mm)

Applications

  • On-board (OBC) and wireless charger
  • IGBT and SiC gate transformer driver bias supply
GUID-20211228-SS0I-SJBH-RL3D-J5VCQ9FTHVNK-low.jpgTop of Board
GUID-20211228-SS0I-GR55-BV52-R8DSQGSW8KT0-low.jpgBlock Diagram
GUID-20211228-SS0I-85ML-8SDW-F2WQB7D0S2TK-low.jpgBottom of Board

1 Test Prerequisites

1.1 Voltage and Current Requirements

Table 1-1 Voltage and Current Requirements
Parameter Specifications
Input voltage range 12 V
Output voltage and current 4 × (18 V and –2.5 V, 30 mA), 2.4 W maximum
Nominal switching frequency 400 kHz
Isolation Yes, 3000 VAC, 1 min
Topology Open-loop LLC

1.2 Required Equipment

  • Multimeter (voltage): Fluke 287C
  • Multimeter (current): Fluke 287C
  • DC Source: Chroma 62012P-100-50
  • E-Load: Chroma 63110 module
  • Oscilloscope: Tektronix DPO3054
  • Electrical Thermography: Fluke TiS65

1.3 Dimensions

The board dimensions are 55 mm (length) × 45 mm (width) × 25 mm (height).

GUID-20211228-SS0I-BJPX-65GM-XGDGGPKLCW3R-low.jpg Figure 1-1 Dimensions

2 Testing and Results

2.1 Efficiency Graphs

Efficiency is shown in the following figure.

GUID-20211228-SS0I-QQTM-VQQD-ZSDZ9HTCSGLF-low.png Figure 2-1 Efficiency Graph

 

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