Enpirion
®
Power Evaluation Board User Guide
EP53A8xQI PowerSoC
Table 2. EP53A8HQI Output Voltage Select Table
VS2
VS1
VS0
VOUT
0
0
0
3.3
0
0
1
3.0
0
1
0
2.9
0
1
1
2.6
1
0
0
2.5
1
0
1
2.2
1
1
0
2.1
1
1
1
1.8
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 low-loop-inductance probe tip as shown in Figure 2, and
through-hole test point pair TP2 to measure the output voltage ripple to
avoid noise coupling into the probe ground lead. For more accurate
ripple measurement, please refer to Enpirion Output Ripple
Measurement Methods Application Note (
www.altera.com/enpirion
).
Please contact Power Applications support (
www.altera.com/mysupport
) for any
questions regarding this evaluation board.
Figure 2: Balanced-impedance oscilloscope probe. Wrap bare wire
around the ground shaft and bring the wire close to the probe tip.
This minimizes probe loop inductance and stray noise pickup by
the probe.
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