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AD7171 データシート(PDF) 1 Page - Analog Devices

部品番号 AD7171
部品情報  Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7171 データシート(HTML) 1 Page - Analog Devices

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Circuit Note
CN-0188
Circuits from the Lab™ reference circuits are engineered and
testedfor quickandeasysystemintegrationtohelpsolvetoday’s
analog, mixed-signal, and RF design challenges. For more
informationand/orsupport,visitwww.analog.com/CN0188.
Devices Connected/Referenced
ADA4051-2
Micropower, Zero-Drift, Rail-to-Rail Input
and Output, Dual Op Amp
AD7171
Low Power, 16-Bit, Sigma-Delta ADC
ADR381
2.5 V, Low Noise, High Accuracy, Band
Gap Voltage Reference
ADuM5402
Quad-Channel Isolator with
Integrated DC-to-DC Converter
Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails
Rev. B
CircuitsfromtheLab™circuitsfromAnalogDeviceshavebeendesignedandbuiltbyAnalogDevices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat
room temperature. However, you are solely responsible for testing the circuit and determining its
suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices
be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause
whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
CN-0188 Circuit Evaluation Board (EVAL-CN0188-SDPZ)
System Demonstration Platform (EVAL-SDP-CB1Z)
Design and Integration Files
Schematics, Layout Files, Bill of Materials
CIRCUIT FUNCTION AND BENEFITS
The circuit shown in Figure 1 monitors current in individual
channels of −48 V to better than 1% accuracy. The load current
passes through a shunt resistor, which is external to the circuit.
The shunt resistor value is chosen so that the shunt voltage is
approximately 50 mV at maximum load current.
Figure 1. Low Side Current Monitor for Negative High Voltage Rails (All Connections and Decoupling Not Shown)
SCLK
PDRST
DOUT
VDD
GND
REFIN(+)
AIN+
AIN
GNDISO
GNDISO
GNDISO
+3.3VISO
ADR381
VIN
VOUT
GND
LOAD
SOURCE
+
48V
+
VSHUNT
RSHUNT
ILOAD
AD7171
D1
5.6V
R2
1k
1%
R4
1k
1%
48.7k , 1%
R1
24.9k
U1A
U1B
U1:
ADA4051-2
Q1
+2.5V
D2
R7
4.99k
1%
R5
4.99k
1%
R6
1k
D1: MMSZ5232B-7-F
D2: MBRA120ET3
Q1: ZXMN7A11GTA, 70V N-CH MOSFET
0.1µF
REFIN(–)
R3
0.1µF
10µF
VOA
VIA
VOB
VIC
VOC
VIB
VDD1
GND1
GNDISO
GND1
GNDISO
VISO
+3.3V
ADuM5402
NOTE: OPTIONAL ADuM5402 PROVIDES
GALVANIC ISOLATION FOR DIGITAL SIGNALS
AND ISOLATED POWER FOR CIRCUIT


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