SLVUCK2A january   2023  – april 2023 TPS7H3302-SEP

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Description
    1. 2.1 Related Information
    2. 2.2 Typical Applications
    3. 2.3 Features
    4. 2.4 Performance Specification Summary
  5. 3Test Setup
    1. 3.1 Equipment
      1. 3.1.1 Power Supplies
      2. 3.1.2 Load #1
    2. 3.2 EVM Connectors and Test Points
    3. 3.3 Testing Procedure
      1. 3.3.1 EVM Bode Plot Measurement Setup
      2. 3.3.2 EVM Transient Test
  6. 4Board Layout
  7. 5Schematic
  8. 6Bill of Materials
  9. 7Related Documentation
  10. 8Revision History

3.3 Testing Procedure

Use these steps for testing the EVM with a static DC external load:

  1. Verify all supplies are off prior to connecting the EVM.
  2. Verify proper polarity of power supply and load connections.
  3. Remove jumper on J6 to set device to enable.
  4. Place a jumper on J5 (pins 1 and 2), connecting VDDQSNS to VLDOIN.
    1. Alternatively a separate voltage source can be used for VLDOIN and a separate voltage source of VDDQSNS, thus isolating the two. This method isolates the transients introduced on VLDOIN from impacting VDDQSNS. Additionally, this method allows for reduced internal power dissipation. VLDOIN can be reduced to VTT + VDO.
  5. Set the load to sink desired current up to 3 A.
  6. Connect a power supply VDD using J2/J1, or test points TP1 and TP2. Vin current is less than 100 mA.
  7. Connect power supply to J7/J9 - VLDOIN. VLDOIN current can be up to 3 A and possibly higher during startup.
  8. Connect VTT voltmeter (+) terminal to TP6 and (–) terminal to TP13, or J10.
  9. Connect the load (+) to J11 and (–) to J12. If desired, connect a current meter in series to test VTT sourcing current. Alternatively, connect isolated load (+) from J7 VLDOIN and (-) to J11 to test VTT sinking.
  10. Set the power supply for VLDOIN to 1.5 V.
  11. Set the power supply for VIN to 3 V.
  12. Enable both VIN and VLDOIN supplies.
  13. Connect a scope or voltmeter monitoring VTTREF to TP9 and GND TP, or using SMA J8.
  14. The voltmeter monitoring VTTREF reads approximately 0.75 V
  15. The voltmeter monitoring VTT reads approximately 0.75 V
  16. Enable the VTT load to observed Sink or Source effect on VTT.
  17. Place jumper on J6 to disable the device.
  18. The voltmeter monitoring VTT reads near zero volts, as VTT is discharged when disabled.
  19. The voltmeter monitoring VTTREF still reads approximately 0.75 V as VTTREF is still active when disabled.
  20. Disable supplies to complete the DC static loading test.

Table 3-2 displays the input voltage and output voltage measurement test points. Using the following connection points, monitor VTT and VTTREF regulation overline and overload.

Table 3-2 I/O Voltage Measurement Test Points
EVMInput / Output VoltageTest point
TPS7H3302EVM-SEPVIN2.375 V ≤ VIN ≤ 3.5 VTP15 (+) TP16(–)
VLDOIN0.9 V ≤ VLDOIN ≤ 3.5 VTP7(+) TP11(–)
VDDQSNS1.2 V ≤ VDDQSNS ≤ 3.5 VJ4 or (Pin2 J5)(+) TP12(–)
VTT ½ VDDQSNSTP6(+) TP13(–)
VTTREF½ VDDQSNSTP9(+) TP11(–)