The new amplifiers are based on optical insulation technology and sigma-delta modulation for signal processing.

Motor control power stages require a combination of current sensing and power device protection to achieve accurate fail-safe motor operation. These current sensors, which feedback the motor phase or rail current to the microcontroller, are typically optimized for accuracy to provide precise control. Once a fault condition has been detected, the power device circuitry shuts off the device to prevent destruction of the power device and load.

Avago’s ACPL-785J series of isolation amplifiers come in a compact small outline-16 (SO-16) package with a footprint that is 10.3 mm (L) by 10.2 mm (W) by 3.5 mm (H). The addition of the ACPL-785J to its existing HCPL-78xx family of isolation amplifiers will enable motor control designers to reduce the printed circuit board (PCB) size required for their designs. These new SO-16 packages are compliant to most industrial safety standards such as IEC/EN/DIN EN 60747-5-5, UL 1577 and CSA.

Features and Benefits

— Integrated over-current and overload detection.

— 1µV/degrees-C offset change vs. temperature.

— High CMR (25 kV/µs at VCM = 1000 V) to ignore high common-mode noise and provide smoother control.

— Compact auto-insertable SO-16 package saves PCB space.

— 20 kHz minimum bandwidth.

— Advanced Sigma-Delta A/D converter technology.