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ADP1715-EVALZ

P1-P3P4-P6P7-P8
EVAL-ADP1715/ADP1716
Rev. 0 | Page 4 of 8
EVALUATION BOARD CONFIGURATIONS
The output voltage is set based on the equation
The ADP1715/ADP1716 evaluation boards come supplied with
different components depending on which version is ordered.
Components common to all versions are C1, C2, and J1.
V
OUT
= 0.8 V (1 + R1/R2) (1)
For example, if R1 = 10 kΩ and R2 = 4.99 kΩ, then V
OUT
= 2.403 V.
ADP1715 FIXED OUTPUT WITH SOFT START
ADP1716 FIXED OUTPUT WITH TRACKING
Evaluation boards that come supplied with ADP1715 fixed
output voltage option devices have the C3 soft start capacitor
included. This capacitor controls the rise time when the output
voltage starts up.
Evaluation boards that come supplied with ADP1716 fixed
output voltage option with tracking devices do not have C3,
R1, or R2 populated. The user can instead connect an external
voltage to the TRK pad of the evaluation board to see how the
track feature works.
Figure 3 shows the schematic of this evalua-
tion board configuration.
Figure 5 shows the schematic of this
evaluation board configuration.
06309-003
1
2
3
8
7
6
54
EN
IN
OUT
SS
GND
GND
GND
GND
C3C2
C1
J1
ADP1715
V
OUT
V
IN
U1
0
6309-005
1
2
3
8
7
6
54
EN
IN
OUT
TRK
GND
GND
GND
GND
C2
C1
J1
ADP1716
V
IN
V
OUT
TRK
U1
Figure 3. ADP1715 Fixed Output with Soft Start
Figure 5. ADP1716 Fixed Output with Tracking
ADP1715 ADJUSTABLE OUTPUT
Evaluation boards that come supplied with ADP1715 adjustable
output voltage option devices have the R1 and R2 resistors
included.
Figure 4 shows the schematic of this evaluation board
configuration.
06309-004
1
2
3
8
7
6
54
EN
IN
OUT
ADJ
GND
GND
GND
GND
C1
J1
V
IN
C2
V
OUT
U1
R1
R2
ADP1715
ADJUSTABLE
Figure 4. ADP1715 Adjustable Output
EVAL-ADP1715/ADP1716
Rev. 0 | Page 5 of 8
OUTPUT VOLTAGE MEASUREMENTS
06309-006
V
+–
VOLTAGE
METER
VOLTAGE
SOURCE
GND
VIN
GND EN SS/ADJ/TRK GND
LOAD
VOUT
R1
R2
C3
J1
GND
U1
C2C1
EVAL-ADP1715/ADP1716
Figure 6.
LINE REGULATION
Figure 6 shows how the evaluation board can be connected to
a voltage source and a voltage meter for 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.
For line regulation measurements, the regulator 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 mode during this
measurement, VIN must be varied between VOUT
NOM
+ 0.5 V
(or 2.5 V, whichever is greater) and VIN
MAX
. For an ADP1715
with a 3.3 V fixed 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.
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.
Figure 7 shows the typical line
regulation performance of an ADP1715 with 3.3 V fixed output.
2. Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
3.325
3.265
3.3 3.8 4.3 4.8 5.3
06309-007
V
IN
(V)
V
OUT
(V)
3.315
3.305
3.295
3.285
3.275
I
LOAD
= 100µA
I
LOAD
= 10mA
I
LOAD
= 100mA
I
LOAD
= 250mA
I
LOAD
= 360mA
I
LOAD
= 500mA
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.
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.
If large load currents are to be used, the user needs to connect
the voltage meter as close to the output capacitor as possible, to
reduce the effects of IR drops.
Figure 7. ADP1715 Line Regulation
EVAL-ADP1715/ADP1716
Rev. 0 | Page 6 of 8
LOAD REGULATION DROPOUT VOLTAGE
For load regulation measurements, the regulator output is
monitored while the load is varied. For good load regulation,
the output needs to change as little as possible with varying
loads. The input voltage must be held constant during this
meas-urement. The load current can be varied from 0 mA
to 500 mA.
Dropout voltage measurements can also be performed using
the configuration shown in
Figure 6. 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 2.5 V. Dropout voltage increases with
larger loads. For more accurate measurements, a second voltage
meter can be used 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 8 shows the typical load regulation
performance of an ADP1715 with 3.3 V fixed output for
an input voltage of 3.8 V.
3.325
3.265
0.1 1000
06309-008
I
LOAD
(mA)
V
OUT
(V)
1 10 100
3.315
3.305
3.295
3.285
3.275
Figure 9 shows a typical curve of dropout voltage measurements
with different load currents.
350
0
0.1 1000
06309-009
I
LOAD
(mA)
V
DROPOUT
(mV)
300
250
200
150
100
50
1 10 100
Figure 8. ADP1715 Load Regulation
Figure 9. Dropout Voltage vs. Load Current
P1-P3P4-P6P7-P8

ADP1715-EVALZ

Mfr. #:
Buy ADP1715-EVALZ
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management IC Development Tools 500mA Low Dropout Linear Regulators
Lifecycle:
New from this manufacturer.
Delivery:
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