TIDT277 April   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs, all Outputs Similar Loaded
    2. 2.2 Load Regulation
    3. 2.3 Cross Regulation and Further Data For Non-Symmetrical Loading
    4. 2.4 Line Regulation at Full Load to all Outputs
    5. 2.5 Thermal Images
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Switchnode to GND
      2. 3.1.2 Diode D3
    2. 3.2 Output Voltage Ripple
    3. 3.3 Input Voltage Ripple
      1. 3.3.1 Power Stage Input
      2. 3.3.2 Between L1 and L2
      3. 3.3.3 Input Terminal
    4. 3.4 Start-Up Sequence
    5. 3.5 Shutdown Sequence

Features

  • Two-stage differential input filter to prevent from conducted emissions
  • Three outputs (+17 V and –4 V ) with efficiency 86% at full load, temperature rise only +15 K at full load
  • Simple transformer windings by using virtual output return provides isolation voltage 2500 VRMS
  • No optoisolator design, primary-side regulation
  • Two-layer board, single-side assembly, high-power density by using integrated FET, circuit geometry 70 mm × 35 mm
  • Maximum height 7.4 mm (by low profile transformer)