SLUU150 – February 2003
11
Evaluation Modules for Simple –48-V Hot Swap Controllers
3.2.2
Functional Test
1. Turn on the power supply. On the EVM, place the POWER switch in the ON position.
Verify the red LED is OFF. Verify the DVM reading is 0
±
100 mV.
2. Place the ENABLE switch in the ON position. Verify the red LED remains off, and the DVM
now displays approximately the input supply voltage level. The scope should have
acquired a sweep similar to that shown in Figure 4.
The brief fault timing ramp which is shown in Figure 4 may or may not be present,
depending on the actual values of the timing parameters for the particular board being
used. If the load voltage ramps to full input potential during the initial reduced rate ramp
period, then fault timing does not initiate.
3. Place either the POWER or ENABLE switch in the OFF position to remove power from the
VOUT terminals.
EN
IRAMP
FLTTIME
VOUT–
Figure 4. Load Ramp-Up Waveforms
