6.2
Check-Out Steps
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Test Procedure
Turn the voltage adjust knobs of both power supplies fully CCW. Adjust the current limit control of the
15-V supply for 10 amps minimum output.
If not already done, connect the EVM and test equipment as shown in
Turn on the 3.3-V power supply, and adjust the output for 3.3 V 5% at test point TP2. Turn on the second
supply, and adjust the output for 12 V 5% at TP1. Verify all STATUS LED’s (located just above the slide
switches) are OFF.
On the oscilloscope, set the Channel 1 and 2 amplifiers to the 2 V/div scale, and position the traces
appropriately in the top half of the display for viewing 3.3-V magnitude waveforms. Set the Channel 3
amplifier scale to 100 or 200 mV/div, and position that trace about one division below center of the screen.
Set the current pulse amplifier scale to 100 mA/div, and position that trace towards the bottom of the
scope screen. Set the scope to trigger on the rising edge of Channel 1, at a threshold of about 1.5 V. Set
the time base to 1 mS/div, and set the trigger mode to NORMAL.
On the EVM board, place the SLOT A MP ENABLE switch in the LO position. The SLOT A MP green
STATUS LED should illuminate. On the oscilloscope, verify a waveform capture was obtained similar to
the one shown in
. The total voltage ramp time of the Channel 1 waveform, from 0 volts to about
3.2 volts should be 2.6 0.6 mS. The Channel 3 waveform should attain a peak amplitude (prior to pulling
low again) of about 180 mV, for a nominal 2.6 ms output ramp time. The actual amplitude obtained varies
linearly with the ramp time, and has some inherent tolerance of its own. The peak amplitude of the current
pulse on Channel 4 should be 195 25 mA. A DVM can be used to verify the voltage at TP8 (with respect
to ground at TP9) is within 10 mV of the 3.3-V input supply voltage at 3V3IN1 (TP2).
Figure 4. Output Ramp-Up Waveforms – 3.3-A Rail
SLUU328 – August 2008
TPS2358 Dual-Slot ATCA™ AdvancedMC™ Controller Evaluation Module
9