Datasheet

InputCurrent
(12VIN)
2A/div
SLOT_PWR
5V/div
SLOT_MP
2V/div
Test Procedure www.ti.com
Remove the current probe from the 3.3-V supply lead, and clamp it across the 12VIN supply lead. Change
the Channel 4 amplifier scale to 2 A/div. Set the scope to trigger on Channel 2, and adjust the scope
trigger threshold to about 3 V.
In the GUI 12V CONTROL panel, click on the PASS FET button. In the STATUS panel, verify the 12V
PASS FET, BLK FET, and OUT>PG Threshold indicators turn GREEN. On the EVM board, the PWR PGD
green STATUS LED should be illuminated.
On the scope, verify a waveform was obtained similar to that shown in Figure 6 . The total ramp time of the
Channel 2 trace, from 0 V to about 11.8 V should be 1.3 0.3 ms. Note that the extent of variance of the
12-V supply setting from a nominal 12.0 V affects this timing result. The average amplitude of the current
pulse (i.e., across the flattest part of the peak) on Channel 4 should be 7.9 0.8 A. A DVM can be used to
verify the voltage at TP4 (with respect to ground at TP6) is essentially the same as the input supply
potential at 12VIN.
Figure 6. Output Ramp-Up Waveforms - SLOT_PWR Rail.
12 TPS2459 Full-Featured AdvancedMC™ Slot Controller Evaluation Module SLUU349 – March 2009
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