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.

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)