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)

4.4.2 Output Voltage Start-Up Time Test

Follow the instructions to verify the individual channels output voltage start-up time:

  1. Set up the oscilloscope as listed in Table 4-7.
  2. Set the load resistance to 16 Ω ±1 Ω and the power supply voltage to 24 V.
  3. Enable the load.
  4. Enable the power supply and verify that the output voltage startup waveform is as shown in Figure 4-2.
Table 4-7 TPS2640EVM Oscilloscope Setting for the Output Voltage Start-Up Test
Oscilloscope SettingCH1 Probe PointsCH2 Probe Points
Channel 1 = 10 V / divVOUT1 (TP3)VOUT2 (TP12)
Channel 2 = 10 V / divVIN1 (TP2)VIN2 (TP11)
Channel 3 = 20 V / divFLTb1 (TP1)FLTb2 (TP10)
Channel 4 = 1 A / divInput current into T1 +Ve wireInput current into T3 +Ve wire
Trigger source = Channel 1
Trigger level = 12 V ±1 V
Trigger polarity = Rising
Trigger mode = Single
Time base2 ms / div
GUID-6C40A453-FDE1-4B74-956C-7EFB57B6C909-low.pngFigure 4-2 Output Voltage Start-Up Waveform