SLVU356A January   2010  – October 2021 TPS54290 , TPS54291

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Description
    2. 1.2 Applications
    3. 1.3 Features
  3. 2TPS54291EVM-431 Electrical Performance Specifications
  4. 3Schematic
    1. 3.1 Enable Jumpers (JP1 and JP2)
    2. 3.2 Error Amplifier Outputs
    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 TPS54291 IC 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 Setup
    1. 4.1 Equipment
      1. 4.1.1 Voltage Source (VIN)
      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/Shutdown 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. 5TPS54291EVM-431 Typical Performance Data and Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Line and Load Regulation
    3. 5.3 Switch Node and Output Ripple Voltage
  7. 6EVM Assembly Drawings and Layout
  8. 7List of Materials
  9. 8Revision History

4.2.1 Procedure

  1. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected referencing the user to earth ground before power is applied to the EVM. An electrostatic smock and safety glasses should also be worn.
  2. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 2.0-A maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 4-1.
  3. Connect the ammeter A1 (0-A to 5-A range) between VIN and J1 as shown in Figure 4-1.
  4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 4-1.
  5. Connect LOAD1 to J2 as shown in Figure 4-1. Set LOAD1 to constant current mode to sink 0 Adc before VIN is applied.
  6. Connect voltmeter V2 across TP3 and TP4 as shown in Figure 4-1.
  7. Connect LOAD2 to J3 as shown in Figure 4-1. Set LOAD2 to constant current mode to sink 0 Adc before VIN is applied.
  8. Connect voltmeter V3 across TP18 and TP19 as shown in Figure 4-1.
  9. Place a fan as shown in Figure 4-2 and turn it on, making sure air is flowing across the EVM.