TIDUF73 September   2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Design Theory
      2. 2.2.2 Resistor Selection
        1. 2.2.2.1 Transistor and Diode Selection
      3. 2.2.3 Overcurrent Detection – Short-Circuit Protection
    3. 2.3 Highlighted Products
      1. 2.3.1 TPSI3100-Q1
      2. 2.3.2 INA180-Q1
      3. 2.3.3 TPSI2140-Q1
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 External Hardware Requirements
    2. 3.2 Test Setup
    3. 3.3 Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.2 Test Setup

To test the normal operation of the passive precharge reference design, implement the following steps:

  1. Connect a 5V power supply to the banana jacks of the VDDP, EN_PRCHG, and EN_DSCHG, with the negative lead connected to VSSP.
  2. Before placing in the enclosure or connecting the high-voltage power supply, power the TPSI3100-Q1 and verify all voltages on the primary and secondary side are as expected.
  3. Perform step 2 with TPSI2140-Q1 verifying the internal FETs are on through measuring the resistance between S1 and S2.
  4. Turn off the 5V power supplies leaving the cables attached.
  5. Placing the board in the enclosure, attach one lead of the precharge resistor to J2 and the other lead to J3.
  6. Attach the positive terminal of the capacitor to J3 and the negative terminal to J4.
  7. Attach the high-voltage power supply positive lead to J1 and the negative to J4.
  8. Connect an isolated probe to S1-HV– to measure the voltage across the capacitor as the capacitor charges.
  9. Connect an isolated probe to VDRV-VSSS to show the step of the drive pin.
  10. Close the enclosure and energize the high-voltage power supply.
  11. Power the 5V supply and observe the cycle, powering the supply off after a second.
  12. Turn off the high-voltage supply
  13. Power the 5V supply again to energize EN_DSCHG to discharge the capacitor
    1. Wait at least 2 minutes before opening the high-voltage enclosure.
    2. If the power supply has the ability to show a constant read of the capacitor voltage, this can be used to show the progress of the discharge cycle