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ADP7183-EVALZ 数据表(PDF) 6 Page - Analog Devices

部件名 ADP7183-EVALZ
功能描述  Output voltage accuracy
Download  9 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP7183-EVALZ 数据表(HTML) 6 Page - Analog Devices

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UG-795
ADP7183-EVALZ User Guide
Rev. 0 | Page 6 of 9
+
VOLTAGE SOURCE
LOAD
–+
AMMETER
–0.00355 A
Figure 7. Ground Current Measurement Setup
GROUND CURRENT MEASUREMENTS
Figure 7 shows how to connect the ADP7183 evaluation board to a
voltage source and an ammeter for ground current measurements.
Use a resistor as the load for the regulator. Ensure that the resistor
has a power rating that is adequate to handle the power expected
to dissipate across it. As an alternative, use an electronic load.
Ensure that the voltage source can supply enough current for
the expected load levels.
Follow these steps to connect the evaluation board to a voltage
source and ammeter:
1.
Connect the negative terminal (−) of the voltage source to
the VIN pad on the evaluation board.
2.
Connect the negative terminal (−) of the ammeter to one of
the GND pads of the evaluation board.
3.
Connect the positive terminal (+) of the ammeter to the
positive terminal (+) of the voltage source.
4.
Connect a load between the positive terminal (+) of the
voltage source and the VOUT pad of the evaluation board.
When these connection steps are completed, turn on the voltage
source. If J1 is inserted (connecting EN 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 regulators consume while the circuits
perform the regulation function. To be efficient, the regulators
must consume as little current as possible. Typically, the regulators
use the maximum current when supplying their largest load level
(−300 mA for the ADP7183). Figure 8 shows the typical ground
current consumption for the various load levels at VOUT = −3.3 V
and TA = 25°C.
When the device is disabled (EN = GND), the ground current
drops to less than 1 μA.
ILOAD (mA)
–3.5
–4.0
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
0
–300
–200
–100
0
Figure 8. Ground Current vs. Load Current (ILOAD), VOUT = −3.3 V, TA = 25°C


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