IR21771S_15 Datasheet, PDF (1/16 Pages) International Rectifier – Phase Current Sensor IC for AC motor control

Data Sheet No. PD60234 revB
IR22771S/IR21771S(PbF)
Phase Current Sensor IC for AC motor control
Features
• Floating channel up to 600V for IR21771 and 1200V for
IR22771
• Synchronous sampling measurement system
• High PWM noise (ripple) rejection capability
• Digital PWM output
• Fast Over Current detection
• Suitable for bootstrap power supplies
• Low sensing latency (<7.5 µsec @20kHz)
Product Summary
V_OFFSET (max)
IR22771
IR21771
V_in range
Bootstrap supply range
Floating channel quiescent
current (max)
Sensing latency (max)
Throughput
Over Current threshold (max)
1200 V
600V
±250mV
8-20 V
2.2 mA
7.5 µsec
(@20kHz)
40ksample/sec
(@20kHz)
±470 mV
Description
IR21771/IR22771 is a high voltage, high speed, single phase
current sensor interface for AC motor drive applications. The
current is sensed by an external shunt resistor. The IC converts the
analog voltage into a time interval through a precise circuit that also
performs a very good ripple rejection showing small group delay.
The time interval is level shifted and given to the output. The max
throughput is 40 ksample/sec suitable for up to 20 kHz
asymmetrical PWM modulation and max delay is <7.5µsec
(@20kHz). Also a fast over current signal is provided for IGBT
protection.
Package
Typical Connection
(Please refer to
Lead Assignments
for correct pin
configuration. This
diagram shows
electrical
connections only)
1
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