EVAL-CN0240-SDPZ 查看數據表（PDF） - Analog Devices

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EVAL-CN0240-SDPZ

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

Analog Devices 

CN-0240

Circuit Note

supply line. Clocks and other fast switching digital signals

should be shielded from other parts of the board by digital

ground.

A complete design support package for this circuit note,

including complete schematics and board layouts, can be

found at www.analog.com/CN0240-DesignSupport.

• Dual power supply: ±15 V@ 10 mA

• Shunt resistor with maximum voltage of 100 mV at the

maximum load current.

• Source voltage and electronic load

Getting Started

COMMON VARIATIONS

There are a number of solutions available for high-side sensing

of positive and negative sources. IC solutions using current

sense amplifiers, difference amplifiers, or a combination of

these are available. See the circuits described in the following

circuit notes: CN0100, CN0188, CN0218.

Load the evaluation software by placing the CN0218 evaluation

software disc in the CD drive of the PC. Using "My Computer,"

locate the drive that contains the evaluation software disc and

open the Readme file. Follow the instructions contained in the

Readme file for installing and using the evaluation software.

Functional Block Diagram

“High-Side Current Sensing: Difference Amplifier vs. Current

Sense Amplifier,” Analog Dialogue, January 2008, describes the

use of current sense and difference amplifiers. The article is

available at www.analog.com/HighSide_CurrentSensing.

See Figure 1 of this circuit note for the circuit block diagram

and the EVAL-CN0240-SDPZ-SCH pdf file for the circuit

schematics. This file is contained in the CN0240 Design

Support Package.

The following URLs link to Analog Devices products useful in

solving the current sense problem:

Current sense amplifiers: www.analog.com/CurrentSenseAmps

Difference amplifiers: www.analog.com/DifferenceAmps

Instrumentation amplifiers: www.analog.com/InstrumentationAmps

CIRCUIT EVALUATION AND TEST

WARNING! HIGH VOLTAGE. THIS CIRCUIT MAY

CONTAIN LETHAL VOLTAGES. DO NOT OPERATE,

EVALUATE, OR TEST THIS CIRCUIT, OR BOARD

ASSEMBLY, UNLESS YOU ARE A TRAINED

PROFESSIONAL, WHO IS QUALIFIED TO HANDLE HIGH

VOLTAGE CIRCUITRY. BEFORE APPLYING POWER, YOU

MUST BE FAMILIAR WITH THE CIRCUITRY AND ALL

REQUIRED PRECAUTIONS FOR WORKING WITH HIGH

VOLTAGE CIRCUITS.

This circuit uses the EVAL-CN0240-SDPZ circuit board and the

EVAL-SDP-CB1Z System Demonstration Platform (SDP)

evaluation board. The two boards have 120-pin mating

connectors, allowing for the quick setup and evaluation of the

circuit’s performance. The EVAL-CN0240-SDPZ board contains

the circuit to be evaluated, as described in this note, and the

SDP evaluation board is used with the CN0240 evaluation

software to capture the data from the EVAL-CN0240-SDPZ

circuit board.

Equipment Needed

• PC with a USB port and Windows® XP or Windows Vista®

(32-bit), or Windows® 7 (32-bit)

• EVAL-CN0240-SDPZ circuit evaluation board

• EVAL-SDP-CB1Z SDP evaluation board

• CN0240 evaluation software

Setup

Connect the 120-pin connector on the EVAL-CN0240-SDPZ

circuit board to the connector marked “CON A” on the

EVAL-SDP-CB1Z evaluation (SDP) board. Nylon hardware

should be used to firmly secure the two boards, using the holes

provided at the ends of the 120-pin connectors.

Connect a shunt resistor (RSHUNT) across the J4 input terminals

with a load to ground as indicated in Figure 1. With power to

the supply off, connect a +6 V power supply to the pins marked

“+6 V” and “GND” on the board. If available, a +6 V "wall wart"

can be connected to the barrel connector on the board and used

in place of the +6 V power supply. Connect the USB cable

supplied with the SDP board to the USB port on the PC.

Note: Do not connect the USB cable to the mini USB connector

on the SDP board at this time.

It is important to connect the system ground and the PCB

isolated ground to guarantee correct voltage levels and

operation. Test point 31 and test point 32 give access to the

GND_ISO required to properly make this connection.

Lastly, before applying any high voltage to connector J4, be

certain the ±15 V supply (J5) is properly connected and has

been turned on. If this supply is not active, any high voltage

could potentially damage U2, the AD629, as well as several

other components on the PCB.

Test

Apply power to the +6 V supply (or “wall wart”) connected to

the EVAL-CN0240-SDPZ circuit board. Connect the ±15 V

supplies to the EVAL-CN0240-SDPZ board U12 three-terminal

screw connector. Launch the evaluation software and connect

the USB cable from the PC to the USB mini-connector on the

SDP board.

• Power supply: +6 V @ 1 A, or +6 V “wall wart”

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