SLVUBX9 October   2020 TPS2640

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 EVM Applications
  3. 2Description
  4. 3Schematics
  5. 4General Configurations
    1. 4.1 Physical Access
    2. 4.2 Test Equipment
      1. 4.2.1 Power Supplies
      2. 4.2.2 Meters
      3. 4.2.3 Oscilloscope
      4. 4.2.4 Loads
    3. 4.3 Test Setup
    4. 4.4 Test Procedure
      1. 4.4.1 Preliminary Tests
      2. 4.4.2 Output Voltage Start-Up Time Test
      3. 4.4.3 Current Limit and Fault Responses Test
      4. 4.4.4 Output Short-Circuit Protection Test
      5. 4.4.5 Reverse Polarity Test
        1. 4.4.5.1 Overvoltage Clamp Response
  6. 5EVM Board Assembly Drawings and Layout Guidelines
    1. 5.1 PCB Drawings
  7. 6Bill Of Materials (BOM)

4.4.1 Preliminary Tests

  1. Turn on the power supply and set the output voltage and the current limit according to Table 4-4.
    Table 4-4 Power Supply Setting for the TPS2640EVM
    EVM Channel Voltage Set Point Power Supply Current Limit
    TPS2640EVM CH1 24 V 3 A
    CH2 24 V 3 A
  2. Turn on the load and set the load resistance to 16 Ω ±1 Ω.
  3. Disable the power supply, load and hook up the TPS2640EVM assembly as shown in Figure 4-1.
  4. Make sure the default evaluation board jumper settings are as shown in Table 4-5.
    Table 4-5 Default Jumper Setting for the TPS2640EVM
    J1 J2 J3 J4 J5 J6 J7 J15
    CH1 Install Install

    Open

    		 2-3 1-2

    Open

    		 2-3

    Install
    J8 J9 J10 J11 J12 J13 J14 J16
    CH2 Install Install

    Open

    		 2-3 1-2

    Open

    2-3

    Install
  5. Enable the power supply and the load.
  6. Connect the negative probe of the DMM to TP7 or TP18 test points, the positive probe to the respective test points, and verify that the voltages shown in Table 4-6 are obtained.
    Table 4-6 TPS2640EVM DMM Readings at Different Test Points
    Voltage Test on (CH1) Measured Voltage Reading Voltage Test on (CH2) Measured Voltage Reading
    VIN1 (TP2) 24 V ±1 V DC VIN2 (TP11) 24 V ±1 V DC
    VOUT1 (TP3) 24 V ±1 V DC VOUT2 (TP12) 24 V ±1 V DC
    IMON1 (TP5) 2.3 V ±0.2 V DC IMON2 (TP14) 2.3 V ±0.2 V DC
    FLTb1 (TP1) 22.6 V ±0.5 V DC FLTb2 (TP10) 22.6 V ±0.5 V DC
    SHDNb1 (TP4) 2.7 V ±0.5 V DC SHDNb2 (TP13) 2.7 V ±0.5 V DC
  7. Press the CH1/CH2 shutdown switch S1/S2 and verify the CH1/CH2 output voltage VOUT1/VOUT2 drops to zero. Release the S1/S2 switch and verify the output voltage resumes to nominal 24 V ±1 V.
  8. Disable the power supply and the load.