SLUU285D July   2007  – October 2021 TPS54283 , TPS54286 , TPS54383 , TPS54386

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Description
    2. 1.2 Applications
    3. 1.3 Features
  3. 2TPS54383EVM Electrical Performance Specifications
  4. 3Schematic
    1. 3.1 Sequencing Jump (JP3)
    2. 3.2 Enable Jumpers (JP1 and JP2)
    3. 3.3 Test Point Descriptions
      1. 3.3.1 Input Voltage Monitoring (TP1 and TP2)
      2. 3.3.2 Channel 1 Output Voltage Monitoring (TP3 and TP4)
      3. 3.3.3 Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8)
      4. 3.3.4 Channel 1 Switching Waveforms (TP9 and TP10)
      5. 3.3.5 TPS54383 Device Ground (TP11)
      6. 3.3.6 Channel 2 Switching Waveforms (TP12 and TP13)
      7. 3.3.7 Channel 2 Loop Analysis (TP14, TP15, TP16 and TP17)
      8. 3.3.8 Output Voltage Monitoring (TP18 and TP19)
  5. 4Test Set Up
    1. 4.1 Equipment
      1. 4.1.1 Voltage Source
      2. 4.1.2 Meters
      3. 4.1.3 Loads
      4. 4.1.4 Oscilloscope
      5. 4.1.5 Recommended Wire Gauge
      6. 4.1.6 Other
    2. 4.2 Equipment Setup
      1. 4.2.1 Procedure
      2. 4.2.2 Diagram
    3. 4.3 Start Up / Shut Down Procedure
    4. 4.4 Output Ripple Voltage Measurement Procedure
    5. 4.5 Control Loop Gain and Phase Measurement Procedure
    6. 4.6 Equipment Shutdown
  6. 5TPS54383EVM Typical Performance Data and Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Line and Load Regulation
    3. 5.3 Output Voltage Ripple
    4. 5.4 Switch Node
    5. 5.5 Control Loop Bode Plot (low line, VIN = 8 V)
    6. 5.6 Light Load Operation (revision A PCB only)
  7. 6EVM Assembly Drawings and Layout
  8. 7List of Materials
  9. 8Revision History

3.3.3 Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8)

TPS54383EVM contains a 51-Ω series resistor (R1) in the feedback loop to allow for matched impedance signal injection into the feedback for loop response analysis. An isolation transformer should be used to apply a small (30 mV or less) signal across R1 through TP6 and TP8. By monitoring the ac injection level at TP8 and the returned ac level at TP6, the power supply loop response can be determined.