ACPL-790B-000E

The ACPL-790B/790A/7900 precision miniature isolation amplifiers were designed for current sensing and voltage sensing in electronic power converter applications such as 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-790A (±1% gain tolerance) and the ACPL-7900 (±3% gain tolerance) are recommended. For high precision applications, the ACPL-790B (±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 currrent sensor captures transients in short circuit and overload conditions. The high common-mode transient immunity (15 kV/µs) of the ACPL-790B/790A/7900 provides the precision and stability needed to accurately monitor motor current in high noise motor control environments, providing smoother control (less “torque ripple”) in various types of motor control applications.

Combined with superior optical coupling technology, the ACPL-790B/790A/7900 precision miniature isolation amplifiers implement 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 DIP-8 package that meets worldwide regulatory safety standards. (Also available in smaller Stretched SO-8 package ACPL-C79B/C79A/C790.