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ADP1740-1.5-EVALZ

P1-P3P4-P6P7-P9P10-P12
EVAL-ADP1740/ADP1741
Rev. 0 | Page 4 of 12
OUTPUT VOLTAGE MEASUREMENT
Figure 3 shows how the evaluation board can be connected to a
voltage source and a voltmeter for basic output voltage accuracy
measurements. A resistor can be used as the load for the regulator.
Ensure that the resistor has a power rating adequate to handle
the power expected to be dissipated across it. An electronic load
can be used as an alternative. In addition, 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 voltmeter to one
of the GND pads.
5. Connect the positive terminal (+) of the voltmeter to the
VOUT pad.
The voltage source can now be turned on. If J1 is inserted
(connecting EN to VIN for automatic startup), the regulator
powers up.
If the load current is large, connect the voltmeter as close as
possible to the output capacitor to reduce the effects of IR drops.
VOLTMETER
+–
VOLTAGE SOURCE
1.99711
LOAD
07154-003
+–
Figure 3. Output Voltage Measurement Setup
EVAL-ADP1740/ADP1741
Rev. 0 | Page 5 of 12
LINE REGULATION
For line regulation measurements, the regulator output is
monitored while its input is varied. For good line regula-
tion, the output must change as little as possible with varying
input levels.
To ensure that the device is not in dropout mode during this
measurement, V
IN
must be varied between V
OUTNOM
+ 0.4 V
(or + 1.6 V, whichever is greater) and V
INMAX
. For example, for
an ADP1740 with fixed 1.5 V output, V
IN
needs to be varied
between 1.9 V and 3.6 V. This measurement can be repeated
under different load conditions. Figure 4 shows the typical line
regulation performance of an ADP1740 with fixed 1.5 V output.
1.520
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
1.8 2.0 2.4 2.8 3.6
07154-004
OUTPUT VOLTAGE (V)
V
IN
(V)
2.2 2.6 3.0 3.2 3.4
LOAD = 10mA
LOAD = 100mA
LOAD = 400mA
LOAD = 800mA
LOAD = 1.2A
LOAD = 2A
Figure 4. Output Voltage vs. Input Voltage
LOAD REGULATION
For load regulation measurements, the output of the regulator
is monitored while the load is varied. For good load regulation,
the output must change as little as possible with varying loads.
The input voltage must be held constant during this measure-
ment. The load current can be varied from 500 A to 2 A. Figure 5
shows the typical load regulation performance of an ADP1740
with fixed 1.5 V output for an input voltage of 1.9 V.
1.520
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
10
10k
OUTPUT VOLTAGE (V)
100 1k
LOAD CURRENT (mA)
07154-005
Figure 5. Output Voltage vs. Load Current
DROPOUT VOLTAGE
Dropout voltage can be measured using the configuration
shown in Figure 3. Dropout voltage is defined as the input-to-
output voltage differential when the input voltage is set to the
nominal output voltage. This applies only for output voltages
above 1.6 V. Dropout voltage increases with larger loads.
For more accurate measurements, use a second voltage meter
to monitor the input voltage across the input capacitor. The
input supply voltage may need to be adjusted to account for IR
drops, especially if large load currents are used. Figure 6 shows
a typical curve of dropout voltage measurements with different
load currents.
0.25
0.20
0.15
0.10
0.05
0
101
10k
DROPOUT VOLTAGE (mV)
100 1k
LOAD CURRENT (mA)
07154-006
1.6V
2.5V
Figure 6. Dropout Voltage vs. Load Current
EVAL-ADP1740/ADP1741
Rev. 0 | Page 6 of 12
GROUND CURRENT MEASUREMENT
Figure 8 shows how the evaluation board can be connected to a
voltage source and an ammeter for ground current measure-
ments. A resistor can be used as the load for the regulator.
Ensure that the resistor has a power rating adequate to handle
the power expected to be dissipated across it. An electronic load
can be used as an alternative. Ensure that the voltage source used
can supply enough current for the expected load levels.
Follow these steps to connect to a voltage source and ammeter:
1. Connect the positive terminal (+) of the voltage source to
the VIN pad on the evaluation board.
2. Connect the positive terminal (+) of the ammeter to one of
the GND pads of the evaluation board.
3. Connect the negative terminal (−) of the ammeter to the
negative (−) terminal of the voltage source.
4. Connect a load between the VOUT pad of the evaluation
board and the negative (−) terminal of the voltage source.
The voltage source can now be turned on. If J1 is inserted (EN
is connected to VIN for automatic startup), the regulator
powers up.
GROUND CURRENT CONSUMPTION
Ground current measurements can determine how much
current the internal circuits of the regulator are consuming
while the circuits perform the regulation function. To be
efficient, the regulator needs to consume as little current as
possible. Typically, the regulator uses the maximum current
when supplying its largest load level (2 A). Figure 7 shows the
typical ground current consumption for various load levels at
V
IN
= 1.9 V. When the device is disabled (EN = GND), ground
current drops to less than 2 µA.
1600
1400
1200
1000
800
600
400
200
0
10
10k
GROUND CURRENT (µA)
100 1k
LOAD CURRENT (mA)
07154-008
Figure 7. Ground Current vs. Load Current
AMMETER
+–
VOLTAGE SOURCE
0.00112
LOAD
0
7154-007
+–
Figure 8. Ground Current Measurement
P1-P3P4-P6P7-P9P10-P12

ADP1740-1.5-EVALZ

Mfr. #:
Buy ADP1740-1.5-EVALZ
Manufacturer:
Analog Devices Inc.
Description:
Evaluation Board For The Adp1740/Adp1741
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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