EVAL-ADP7159 Datasheet, PDF (5/9 Pages) Analog Devices – Power supply rejection ratio

EVAL-ADP7159 User Guide
OUTPUT VOLTAGE MEASUREMENTS
VOLTAGE
SOURCE
+
–
UG-811
VOLTMETER
3.29999
+
–
LOAD
Figure 5. Output Voltage Measurement Setup, ADP7159CP-04-EVALZ (10-Lead LFCSP)
VOLTAGE
SOURCE
+
–
VOLTMETER
3.29999
+
–
LOAD
Figure 6. Output Voltage Measurement Setup, ADP7159RD-04-EVALZ (8-Lead SOIC)
Figure 5 andFigure 6 show the connections to a voltage source and
a voltmeterfor basic output voltage accuracy measurements forthe
ADP7159CP-04-EVALZ and ADP7159RD-04-EVALZ. Use a
resistorasthe load forthe regulator. Ensure the resistorhas a power
rating that can handle the power dissipatedacrossit. An electronic
load can also be used as an alternative to using a resistorload.
Ensure that the voltage source suppliesenoughcurrent for the
expected load levels.
The stepson howto connect either the ADP7159CP-04-EVALZ
or ADP7159RD-04-EVALZ to a voltage source anda voltmeter
are as follows:
1. Connect the negative terminal of the voltage source to one
of the GND pins on the evaluation board.
2. Connect the positive terminal of the voltage source to the
VIN pin on the evaluation board.
3. Connect a load between the evaluation board VOUT pin
and one of the GND pins.
4. Connect the negative terminal of the voltmeter to one of
the GND pins on the evaluation board.
5. Connect the positive terminal of the voltmeterto the
VOUT pin on the evaluation board.
When these steps are complete, turn on the voltage source. If
the JP1 jumper is inserted (connecting the EN pin to the
VIN pin for automatic startup), the regulator powers up.
If the load current is large, connect the voltmeter as close as
possible to the outputcapacitor to reduce the effectsof voltage drops.
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