Phase Current Sensor IC
Data Sheet No. PD60233 revB
IR2277S/IR2177S(PbF)
Phase Current Sensor IC for AC motor control
Features
• Floating cha...
Description
Data Sheet No. PD60233 revB
IR2277S/IR2177S(PbF)
Phase Current Sensor IC for AC motor control
Features
Floating channel up to 600 V for IR2177 & 1200 V for
IR2277
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) Ratiometric analog output suitable for DSP A/D interface
Product Summary
VOFFSET (max) IR2277
1200 V
IR2177 600 V
Vin range
±250mV
Bootstrap supply range
8-20 V
Floating channel quiescent current (max) Sensing latency (max)
Throughput
Over Current threshold (max)
2.2 mA
7.5 µsec (@20kHz) 40ksample/sec (@20kHz) ±470 mV
Description
IR2177/IR2277 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 both as a PWM signal (PO) and analog voltage (OUT). The analog voltage is proportional to the measured current and is ratio metric with respect to an externally provided voltage reference. The max throughput is 40 ksample/sec suitable for up to 20 kHz asymmetrical PWM
modulation and max delay is <7.5 µsec (@20kHz). Also a fast over
current signal is provided for IGBT protection....
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