Enpirion
®
Power Evaluation Board User Guide
EN5395QI PowerSoC
Test Recommendations
Recommendations
To guarantee measurement accuracy, the following precautions should be
observed:
1. Make all input and output voltage measurements at the board using the
test points provided. This will eliminate voltage drop across the line and
load cables that can produce false readings.
2. Measure input and output current with series ammeters or accurate
shunt resistors. This is especially important when measuring efficiency.
3. Use a balanced impedance probe tip to measure switching signals to
avoid noise coupling into the probe ground lead. Output ripple and load
transient deviations are best measured at TP8.
4. The board includes a 5.6k pull-up for the POK signal and ready to
monitor the power OK status.
5. A 15nF soft-start capacitor is populated on the board for ~1msec soft-
start time.
6. This evaluation board is not set up for paralleling multiple devices for
greater load capability. A separate evaluation board is available that
demonstrates a method for parallel operation of 2 EN5395QI devices.
7. The over-current protection circuit typically limits the maximum load
current to approximately 1.5X the rated value – viz. 9A. However, this
is somewhat adjustable via the ROCP pin. Please consult our
Applications Engineering group for assistance in using this feature.
8. DERATING: The evaluation board may not be operated with maximum
power dissipation (input power – output power) beyond a certain
temperature (reference current derating curves in figure 2) for
extended periods of time. The device will shut down when the internal
junction temperature exceeds ~150°C.
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