Analog Devices ADP1711 Evaluation Board ADP1711-2.5-EVALZ ADP1711-2.5-EVALZ Hoja De Datos
Los códigos de productos
ADP1711-2.5-EVALZ
EVAL-ADP1710/ADP1711
Rev. 0 | Page 5 of 8
OUTPUT VOLTAGE MEASUREMENTS
GND
GND
GND
GND
C1
C2
U1
C3
R1
R2
VIN
VOUT
EN
J1
EVAL-ADP1710/ADP1711
NC/ADJ/BYP
+
_
VOLTAGE SOURCE
+
_
VOLTMETER
V
LOAD
NC = NO CONNECT
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Figure 5.
Figure 5 shows how the evaluation board can be connected to a
voltage source and a voltage meter for some basic output voltage
accuracy measurements. A resistor can be used as the load for
the regulator. Ensure the resistor has a power rating adequate
to handle the power expected to be dissipated across it. An elec-
tronic load can be used as an alternative. Ensure the voltage source
used can supply adequate current for the expected load levels.
voltage source and a voltage meter for some basic output voltage
accuracy measurements. A resistor can be used as the load for
the regulator. Ensure the resistor has a power rating adequate
to handle the power expected to be dissipated across it. An elec-
tronic load can be used as an alternative. Ensure the voltage source
used can supply adequate 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, and the positive terminal (+) of the
voltage meter to the VOUT pad.
voltage meter to the VOUT pad.
5. The voltage source can now be turned on. If J1 is inserted
(this connects EN to VIN for automatic startup), then the
regulator powers up.
regulator powers up.
If large load currents are used, then the user must connect the
voltage meter as close as possible to the output capacitor to
reduce the effects of IR drops.
voltage meter as close as possible to the output capacitor to
reduce the effects of IR drops.
LINE REGULATION
For line regulation measurements, the regulator’s output is
monitored while its input is varied. For good line regulation,
the output must change as little as possible with varying input
levels. To ensure the device is not in dropout during this
measurement, VIN must be varied between VOUT
monitored while its input is varied. For good line regulation,
the output must change as little as possible with varying input
levels. To ensure the device is not in dropout during this
measurement, VIN must be varied between VOUT
NOM
+ 0.5 V
(or 2.5 V, whichever is greater) to VIN
MAX
. For an ADP1710
with 3.3 V output, this means VIN needs to be varied between
3.8 V and 5.5 V. This measurement can be repeated under
different load conditions. Figure 6 shows the typical line
regulation performance of an ADP1710 with 3.3 V output.
3.8 V and 5.5 V. This measurement can be repeated under
different load conditions. Figure 6 shows the typical line
regulation performance of an ADP1710 with 3.3 V output.
3.32
3.26
3.3
3.8
4.3
4.8
5.3
V
IN
(V)
V
OU
T
(V
)
3.31
3.30
3.29
3.28
3.27
I
LOAD
= 150mA
I
LOAD
= 100mA
I
LOAD
= 50mA
I
LOAD
= 10mA
I
LOAD
= 1mA
I
LOAD
= 100µA
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Figure 6. ADP1710 Line Regulation