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  • Using the LMG3624EVM-081 65-W USB-C PD High-Density Quasi-Resonant Flyback Converter

    • SLUUCX8 September   2023

       

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  • Using the LMG3624EVM-081 65-W USB-C PD High-Density Quasi-Resonant Flyback Converter
  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Additional Images
    2. 2.2 Using the EVM on a Load with USB-C PD Communication
    3. 2.3 Using the EVM on a Load Without USB-C PD Communication
  8. 3Implementation Results
    1. 3.1 Electrical Performance Specifications
    2. 3.2 Test Setup
      1. 3.2.1 Test Setup Requirements
      2. 3.2.2 Test Setup Diagram
      3. 3.2.3 Test Points
    3. 3.3 Performance Data and Typical Characteristic Curves
      1. 3.3.1  Efficiency Result of 4-Point Average on 20-Vout
      2. 3.3.2  Efficiency Result of 4-Point Average at 15-Vout
      3. 3.3.3  Efficiency Result of 4-Point Average at 9-Vout
      4. 3.3.4  Efficiency Result of 4-Point Average at 5-Vout
      5. 3.3.5  Efficiency Typical Results
      6. 3.3.6  Output Characteristics
      7. 3.3.7  Switching Frequency
      8. 3.3.8  Key Switching Waveforms
      9. 3.3.9  Output Ripple Voltage
      10. 3.3.10 Load Transient Response
      11. 3.3.11 EN55022 Class B Conducted EMI Test Result
      12. 3.3.12 Thermal Images at Full Load (20 V and 3.25 A)
  9. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Trademarks
  11. IMPORTANT NOTICE
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EVM User's Guide

Using the LMG3624EVM-081 65-W USB-C PD High-Density Quasi-Resonant Flyback Converter

Description

The LMG3624EVM-081 is a 65-W USB-C PD evaluation module (EVM) for evaluating an off-line quasi-resonant flyback adapter for AC/DC adapters, chargers, USB wall outlets, and other applications. The EVM meets CoC Tier 2 and DoE Level 6 efficiency requirements. The EVM is intended for evaluation purposes and is not intended to be an end product. The LMG3624EVM-081 converts input voltage of 90 VRMS to 265 VRMS down to a selectable USB-C PD output voltage 20 VDC, with a max 3.25 A, and to 5 VDC, 9 VDC, and 15 VDC, with a max 3.00-A output current rating. The main device used in this design is the LMG3624, 650-V 170-mΩ integrated GaN FET with current sense emulation.

Features

  • 93-94% Efficiency under full-load operation under entire input voltage range
  • 28W/in3 Power density enabled by 180-kHz maximum switching frequency
  • Current sense emulation greatly reduces power losses associated with traditional current sensing circuitry
  • Integration of GaN, driver, OCP, and OTP simplifies design, reduces BOM count, and increases system robustness
  • USB-C output enables full system-level evaluation for end-equipments like adapters, notebook chargers, USB wall outlets

Applications

  • USB-C PD Power Adapters
  • AC-to-DC or DC-to-DC auxiliary power supplies
  • High-density AC-to-DC converters / Adapters for notebook computers, tablet computers, TV, and set-top box
  • USB-C PPS Power Adapters

 
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