EVAL-CN0240-SDPZ 데이터 시트보기 (PDF) - Analog Devices

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EVAL-CN0240-SDPZ

Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection

Analog Devices 

Circuits from the Lab™ reference circuits are engineered and

tested for quick and easy system integration to help solve today’s

analog, mixed-signal, and RF design challenges. For more

information and/or support, visit www.analog.com/CN0240.

Circuit Note

CN-0240

Devices Connected/Referenced

AD629

High Common-Mode Voltage Difference

Amplifier

AD8622

Precision, Low Noise, CMOS, Dual, Rail-to-

Rail Output Op Amp

AD8475

Precision, Selectable Gain, Fully Differential

Funnel Amplifier

ADuM5402

Quad-Channel Isolator with Integrated

DC-to-DC Converter

ADR435

5 V, Low Noise, High Accuracy, XFET

Voltage Reference

AD7170

12-Bit, Low Power Σ-Δ ADC

Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection

EVALUATION AND DESIGN SUPPORT

CIRCUIT FUNCTION AND BENEFITS

Circuit Evaluation Boards

CN-0240 Circuit Evaluation Board (EVAL-CN0240-SDPZ)

System Demonstration Platform (EVAL-SDP-CB1Z)

Design and Integration Files

Schematics, Layout Files, Bill of Materials

15V

This circuit, shown in Figure 1, monitors bidirectional current

from sources with dc voltages of up to ±270 V with less than 1%

linearity error. 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 100 mV at

maximum load current.

RSHUNT

VSOURCE

0V TO

+

+

100mV

VSHUNT

AD629

REF−

1kΩ

−

REF+

−

−15V

10kΩ

15V

−

1/2

1kΩ

AD8622

+

0V TO

−1V

VSHUNT = 0V TO 100mV

LOAD

NOTE: SIGNAL VOLTAGES

SHOWN FOR POSITIVE SOURCE

10kΩ

–

1/2

AD8622

+

0V TO 10V

−15V

10kΩ

2.5V_CM

5V_REF

ADR435

5V

+IN 0.4×

–IN 0.4×

5V

2.5V TO

VOCM 4.5V

+

AD8475

–

10kΩ

REFIN+ VDD

AIN+

SCLK

AD7170 PDSTR

AIN−

DOUT

REFIN− GND

2.5V TO

0.5V

15V

VISO

5V1

VDD1

ADuM5402

VOA

VIA

VOB

VIB

VIC

VOC

GNDISO GND1

Figure 1. High Common-Mode Voltage Bidirectional Isolated Current Monitor (All Connections and Decoupling Not Shown)

Rev. 0

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engineers. Standard engineering practices have been employed in the design and construction of

each circuit, and their function and performance have been tested and verified in a lab environment at

room temperature. However, you are solely responsible for testing the circuit and determining its

suitability and applicability for your use and application. Accordingly, in no event shall Analog Devices

be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause

whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page)

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