The ACPL-C79B/C79A/C790 isolation amplifiers were designed for current sensing and voltage sensing in electronic power converters in applications including motor drives and renewable energy systems. In a typical motor drive implementation, current flows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifier. A differential output voltage that is proportional to the current is created on the other side of the optical isolation barrier.
For general applications, the ACPL-C79A (±1% gain tolerance) and the ACPL-C790 (±3% gain tolerance) are recommended. For high precision applications, the ACPL-C79B (±0.5% gain tolerance) can be used. The current sensor operates from a single 5 V supply and provides excellent linearity and dynamic performance of 60 dB SNR. With 200 kHz bandwidth, 1.6 µs fast response time, the current sensor captures transients in short circuit and overload conditions. The high common-mode transient immunity (15 kV/µs) of the ACPL-C79B/C79A/C790 provides the precision and stability needed to accurately monitor motor current in high noise motor control environments, providing for smoother control (less “torque ripple”) in various types of motor control applications.
Combined with superior optical coupling technology, the ACPL-C79B/C79A/C790 implements sigma-delta analog-to-digital converter, chopper stabilized amplifiers, and a fully differential circuit topology to provide unequaled isolation-mode noise rejection, low offset, high gain accuracy and stability. This performance is delivered in a compact, auto-insertable Stretched SO-8 package that meets worldwide regulatory safety standards. (Also available in DIP8/Gull Wing package ACPL-790B/790A/7900. )
### Features
0.5% High Gain Accuracy (ACPL-C79B only)
–50 ppm/°C Low Gain Drift
0.6 mV Input Offset Voltage
0.05% Excellent Linearity
60 dB SNR
200 kHz Wide Bandwidth
3 V to 5.5 V Wide Supply Range for Output Side
–40°C to +105°C Operating Temperature Range
Advanced Sigma-Delta A/D Converter Technology
Fully Differential Isolation Amplifier
15 kV/µs Common-Mode Transient Immunity
Compact, Auto-Insertable Stretched SO-8 Package
Safety and Regulatory Approvals (pending):
IEC/EN/DIN EN 60747-5-5: 1140 Vpeak working insulation voltage
