Datasheet

UG-056 Evaluation Board User Guide
Rev. B | Page 6 of 12
08525-109
VOLTMETER
+–
VOLTAGE SOURCE
+–
1.99711
LOAD
Figure 9. ADP124/ADP125 Output Voltage Measurement Setup, LFCSP
Figure 7, Figure 8, and Figure 9 show how the evaluation boards
can be connected to a voltage source and a voltage meter for
basic out-put voltage accuracy measurements. A resistor can be
used as the load for the regulator. Ensure that the resistor has a
power rating that is adequate to handle the power that is
expected to dissipate across it. An electronic load can also be
used as an alternative. Ensure that the voltage source can supply
enough current for the expected load levels.
Follow these steps to connect to a voltage source and voltage meter:
1. Connect the negative terminal (−) of the voltage source to
one of the GND pads on the evaluation board.
2. Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
3. Connect a load between the VOUT pad and one of the
GND pads.
4. Connect the negative terminal (−) of the voltage meter to
one of the GND pads.
5. Connect the positive terminal (+) of the voltage meter to
the VOUT pad.
6. If the ADP124 LFCSP board is being used, short R1.
Otherwise, install R1 and R2 for the ADP125 adjustable
LDO.
When these steps are completed, the voltage source can be turned
on. If J1 is inserted (connecting EN to VIN for automatic startup),
the regulator powers up.
If the load current is large, the user must connect the voltage
meter as close as possible to the output capacitor to reduce the
effects of IR drops.