Datasheet

www.ti.com Test Procedure
On the EVM board, set the PWR_OR enable slide switch to the DIS position. Use a DVM to verify the
voltage at TP4 (SLOT_PWR), with respect to ground at TP6, drops to 11.4 0.6 V. Return the PWR_OR
switch to the ENA position.
After completing the above steps, the TPS2459 EVM GUI display should appear as shown in Figure 7 .
Note that all the STATUS indicators are green.
Figure 7. TPS2459 EVM GUI Display – Both Channels Successfully Powered
Set the scope trigger mode to AUTO to get a real-time display of the waveforms. On the EVM board, set
both the PWR and MP enable switches to the DIS position. The STATUS LED’s on the board should
extinguish. On the scope, verify the output voltage waveforms decay towards 0 V. In the GUI screen, the
12V PASS FET and BLK FET, and the 3.3V PASS/BLK FET indicators should display OFF, with the
indicator background color changing to red. Both PG indicators (12V and 3.3V) should change to RED.
Module operation as indicated in the above steps, along with obtaining the indicated GUI responses, is a
good indication of a fully functional board and correct set-up. This is also a good starting point for further
test and user evaluation of the device. Note that the two power channels must be reset by setting the
PASS FET and PASS/BLK FET CONTROL buttons to DISABLED (and returning the ENABLES switches
to the HI position), in order to enable subsequent power-up events.
SLUU349 – March 2009 TPS2459 Full-Featured AdvancedMC™ Slot Controller Evaluation Module 13
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