Block Diagram

Packages

Product Summary

VOFFSET

600Vmax

IQBS

1mA

Vin

+/-260mVmax

Gain temp.drift

20ppm/

o

C (typ.)

fo

40kHz (typ.)

Overcurrent trip

1.5usec (typ)

signal delay (IR2172)

Overcurrent trip level

+/-260mV (typ.)

LINEAR CURRENT SENSING IC

8-Lead PDIP

8-Lead SOIC

Features

condition

Description

IR2171/IR2172 are monolithic current sensing IC

designed for motor drive applications. It senses the

motor phase current through an external shunt resistor,

converts from analog to digital signal, and transfers the

signal to the low side. IR’s proprietary high voltage iso-

lation technology is implemented to enable the high

bandwidth signal processing. The output format is dis-

crete PWM to eliminate need for the A/D input interface

for the IR2172. The dedicated overcurrent trip (OC) sig-

nal facilitates IGBT short circuit protection. The open-

drain outputs make easy for any interface from 3.3V to

15V.

Data Sheet No. PD60192 revG

IR2171/IR2172 (S)

(Refer to Lead Assignments for correct pin

configuration). This/These diagram(s)

show electrical connections only. Please

refer to our Application Notes and

DesignTips for proper circuit board layout.

VB

V+

V-

VS

VCC

PO

COM

IR2171/

IR2172

GND

15V

To Motor Phase

PWM Output

Up to 600V

NC (OC 2172)

Overcurrent

IMPORTANT NOTICE:

For new designs we recommend IR’s new products

IR2175, IR2177, IR21771, IR2277 or IR22771.