Avago Technologies (www.avagotech.com) has released its new current sensing applications and precision optical isolation amplifiers for motor control. The ACPL-790B, ACPL-7900 and ACPL-790A devices improve the response times and accuracy of the Avago isolation amplifier range, providing a smaller footprint package design to address compact applications.

Avago’s high-precision isolation amplifiers are suitable for voltage and current sensing in AC and brushless DC motor drives, servo motor drives, industrial inverters, wind power generation, general analog isolation and solar panel power systems.

Analog voltage drop attributed to the flow of a current in the external resistor in a motor drive implementation is sensed by an ACPL-790B/790A/7900 isolation amplifier. The amplifier safely creates a proportional output voltage on the other side of the optical isolation barrier. Competing solutions based on current transformer technology and Hall Effect technology require a bigger footprint in design and suffer electrical parameter variation over temperature fluctuations.

The ACPL-790B accurate isolation amplifier delivers up to 0.5% high gain accuracy, and provides 200 kHz bandwidth and quick response time of 1.6 ms to allow capture of transient signals in overload and short circuit conditions. It operates from a single supply of 5V that is compatible with outputs of 3.3V. This performance is provided in a compact DIP-8 package that meets worldwide regulatory safety standards and is suitable for automated assembly.