TIDT320A january   2023  – july 2023

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Functional Block Diagram
    3. 1.3 Pin Functions
  6. 2Waveforms
    1. 2.1 Switching Frequency and Operating Modes
    2. 2.2 Output Voltage Ripple
    3. 2.3 Load Transients
    4. 2.4 Start-Up Sequence
  7. 3Testing and Results
    1. 3.1 Efficiency Graphs
    2. 3.2 Efficiency Data
    3. 3.3 No Load and OFF State Power Consumption
    4. 3.4 Thermal Images
    5. 3.5 Bode Plots
    6. 3.6 Load Regulation

Description

This reference design is a GaN-based 45-W active clamp flyback (ACF) providing auxiliary power in server and telecom power supply units (PSU). The UCC28782 ACF controller and LMG2610 GaN half-bridge drive a planar transformer with synchronous rectification using the UCC24612. This supply operates using the PFC bus voltage as an input, and generates an isolated 12-V, 3.7-A output, and a non-isolated 18-V, 400-mA output. The main 12-V output is protected by the TPS74800 ORing controller. Multiple PMP23146 units can be operated in parallel for higher power capability.