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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 ?/SPAN>sec @20kHz)
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 <7.5?/SPAN>sec
(@20kHz). Also a fast over current signal is provided for IGBT
protection.
Product Summary
V
OFFSET
(max)
IR22771 1200 V
IR21771 600V
V
in
range
?50mV
Bootstrap supply range
8-20 V
Floating channel quiescent
current (max)
2.2 mA
Sensing latency (max)
7.5 祍ec
(@20kHz)
Throughput
40ksample/sec
(@20kHz)
Over Current threshold (max)
?70 mV
Package
Typical Connection
(Please refer to
Lead Assignments
for correct pin
configuration. This
diagram shows
electrical
connections only)
Data Sheet No. PD60234 revB
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