5 EVM Setup

For proper operation of the EVM, one 12-V 1-A power supply, two resistive loads, and a couple of voltage meters are required.

Refer to the setup diagram in Figure 5-1 and follow these steps for hot plug:

1. Verify that the power-supply voltage is set at 12 V. Make sure the supply has the capability to provide the needs of the current load. Turn off the supply.
2. Connect the loads to the two output pins – one load connected from VO1 (pin 2 or 3 of J1 on SLVP185) to ground (pin 4 or 5 of J1 on SLVP185), and the other load from VO2 (pin 12 or 13 of J1 on SLVP185) to ground. Monitor the voltages from VO1 and VO2 to ground, respectively.
3. Plug the supply into the interface card; connect the supply from IN1 to ground, then turn the power supply on. Check the voltage from VIN1 to GND. It should be about 12 V.
4. Slide the switch S1 on the interface board (SLVP155) to HI if the hot-swap controller U2 on SLVP185 is the TPS2331 (or to LO if the hot-swap controller U2 on SLVP185 is the TPS2330). Otherwise, the supply will not be connected to the loads, because the TPS2331 is an active-high-enabling device and the TPS2330 is an active-low-enabling device.
5. Short jumpers JP1 and JP3 on the hot-swap board (SLVP185). Do not short the jumper JP2.
6. Plug the hot-swap board (SLVP185) into the interface board (SLVP155). The key installed between pins 1 and 2 of the edge connector ensures that the board can only be inserted in the correct direction.
7. Test points or headers are provided for oscilloscope probes, multimeters, or both. Read the voltage from the multimeters connecting from VO1 (pin 2 or 3 of J1 on SLVP185) and VO2 (pin 12 or 13 of J1 on SLVP185) to GND (pin 4 or 5 of J1 on SLVP185). The values on the meter should be about 5 V and 3.3 V, respectively. Otherwise, the board can have problems or the testing may not be correct.
8. Unplug the SLVP185 board from the interface card.
9. The current limits for VO1 and VO2 were set to be less than 3 A on the EVM. If higher currents are required, adjust the resistor values as indicated in the TPS5102 and TPS2331 data sheets, and use a supply with a higher current rating.