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.
The IR2277S/IR2177S(PbF) is a high‑voltage, high‑speed single‑phase current sensor IC designed for AC motor drive applications. It senses current via an external shunt resistor and provides both PWM (PO) and analog (OUT) outputs that are ratio‑metric to a reference voltage.
The document includes absolute maximum ratings, recommended operating conditions, static and AC electrical characteristics, pin definitions, PCB layout recommendations, and mechanical dimensions. It also provides typical connection diagrams and timing information for the PWM and over‑current outputs.
| Floating channel voltage (IR2177) | 600 V |
|---|---|
| Low sensing latency | < 7.5 µs @ 20 kHz |
| Throughput | 40 ksample/sec |
| Maximum power dissipation | 250 mW |
| Thermal resistance (junction‑to‑ambient) | 90 °C/W |
| Operating temperature range | -40 °C to 125 °C |
The sensor provides a latency of less than 7.5 µs at 20 kHz.
The device is rated for ambient temperatures from –40 °C to 125 °C.
The maximum power dissipation is 250 mW.