ADA4051-2_VB AD [Analog Devices], ADA4051-2_VB Datasheet

ADA4051-2_VB

Manufacturer Part Number

ADA4051-2_VB

Description

Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails

Manufacturer

AD [Analog Devices]

Datasheet

1.ADA4051-2_VB.pdf (5 pages)

Current page: 1 of 5
Download datasheet (154Kb)

EVALUATION AND DESIGN SUPPORT

Circuit Evaluation Boards

Design and Integration Files

Rev. B

Circuits from the Lab™ circuits from Analog Devices have been designed and built by Analog Devices

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)

CN-0188 Circuit Evaluation Board (EVAL-CN0188-SDPZ)

System Demonstration Platform (EVAL-SDP-CB1Z)

Schematics, Layout Files, Bill of Materials

Low Cost, Level Shifted Low Side Current Monitor for Negative High Voltage Rails

0.1µF

48V

SOURCE

5.6V

24.9k

Figure 1. Low Side Current Monitor for Negative High Voltage Rails (All Connections and Decoupling Not Shown)

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/CN0188.

–

SHUNT

10µF

LOAD

48.7k , 1%

U1A

LOAD

ADA4051-2

ADR381

U1:

GND

VIN

ISO

U1B

VOUT

4.99k

GND

ISO

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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.

+2.5V

D1: MMSZ5232B-7-F

D2: MBRA120ET3

Q1: ZXMN7A11GTA, 70V N-CH MOSFET

AIN+

AIN

+3.3V

Devices Connected/Referenced

ADA4051-2

AD7171

ADR381

ADuM5402

REFIN(+)

REFIN(–)

AD7171

ISO

GND

VDD

ISO

PDRST

DOUT

SCLK

NOTE: OPTIONAL ADuM5402 PROVIDES

GALVANIC ISOLATION FOR DIGITAL SIGNALS

AND IS OLATED POWER FOR CIRCUIT

0.1µF

Micropower, Zero-Drift, Rail-to-Rail Input

and Output, Dual Op Amp

Low Power, 16-Bit, Sigma-Delta ADC

2.5 V, Low Noise, High Accuracy, Band

Gap Voltage Reference

Quad-Channel Isolator with

Integrated DC-to-DC Converter

GND

ISO

ADuM5402

ISO

Circuit Note

GND

DD1

www.analog.com

CN-0188

+3.3V

Related parts for ADA4051-2_VB

ADA4051-2_VB Summary of contents

Page 1

... ISO One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 Circuit Note Devices Connected/Referenced Micropower, Zero-Drift, Rail-to-Rail Input ADA4051-2 and Output, Dual Op Amp AD7171 Low Power, 16-Bit, Sigma-Delta ADC 2.5 V, Low Noise, High Accuracy, Band ADR381 Gap Voltage Reference ...

Page 2

... V to −10 V with no modifications. The shunt voltage is amplified by a factor of 49.7 using U1A, where R3/R2. The zero-drift ADA4051-2 offset voltage (15 µV maximum) and does not contribute significant error to the measurement. A full-scale shunt voltage produces a full-scale output voltage from U1A of 2 ...

Page 3

... The following URLs link to Analog Devices products which are useful in solving the current sense problem: Current sense amplifiers: Difference amplifiers: Instrumentation amplifiers: VIN VOUT ADR381 GND +2.5V GND ISO U1: +3.3V ISO ADA4051-1 REFIN(+) U1 AIN+ AD7171 GND ISO AIN− REFIN(–) R3* 48.7kΩ 1kΩ 1% *R1 ADDS 100mV OFFSET TO U1 OUTPUT AND ALLOWS MEASUREMENT AT ZERO LOAD CURRENT USED, REDUCE R3 TO 46.4kΩ ...

Page 4

... If this offset is added, then R3 should be reduced to 46.4 kΩ to maintain a full-scale ADC input voltage of 2.5 V for shunt voltage. Without the offset, the ADA4051-1 output will become nonlinear for output voltages less than about 40 mV. CIRCUIT EVALUATION AND TEST ...

Page 5

... Data Sheets and Evaluation Boards CN0188 Circuit Evaluation Board (EVAL-CN0188-SDPZ) System Demonstration Platform (EVAL-SDP-CB1Z) ADA4051-2 Data Sheet ADA4051-2 Evaluation Board ADA4051-1 Data Sheet ADA4051-1 Evaluation Board AD7171 Data Sheet AD7171 Evaluation Board ADR381Data Sheet ADuM5402 Data Sheet ADuM5402 Evaluation Board REVISION HISTORY 11/11— ...

Related keywords

ADA4051-2_VB datasheet
ADA4051-2_VB data sheet
ADA4051-2_VB pdf datasheet
ADA4051-2_VB component
ADA4051-2_VB part
ADA4051-2_VB distributor
ADA4051-2_VB RoHS
ADA4051-2_VB datasheet download