IR2171_06 Datasheet, PDF (1/6 Pages) International Rectifier – LINEAR CURRENT SENSING IC

Data Sheet No. PD60192 revG
IMPORTANT NOTICE:
IR2171/IR2172 ^(S)
For new designs we recommend IR’s new products
IR2175, IR2177, IR21771, IR2277 or IR22771.
LINEAR CURRENT SENSING IC
Features
• Floating channel up to +600V
• Monolithic integration
• Linear current feedback through shunt resistor
• Direct digital PWM output for easy interface
• Low IQBS allows the boot strap power supply
• Independent fast overcurrent trip signal
• High common mode noise immunity
• Input overvoltage protection for IGBT short circuit
condition
• Open Drain outputs
Product Summary
VOFFSET
IQBS
Vin
Gain temp.drift
fo
Overcurrent trip
signal delay (IR2172)
600Vmax
1mA
+/-260mVmax
20ppm/oC (typ.)
40kHz (typ.)
1.5usec (typ)
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.
Overcurrent trip level
Packages
8-Lead SOIC
+/-260mV (typ.)
8-Lead PDIP
Block Diagram
Up to 600V
15V
PWM Output
GND
Overcurrent
VCC
V+
PO _IR2171/ V-
COM ^IR2172 VB
NC (OC 2172) VS
To Motor Phase
(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.