ACPL-785J-000E

Common Mode Rejection Ratio (Min) :
Mounting Style : SMD/SMT
Packaging : Tube
Operating Temperature Range : - 40 C to + 85 C
Input Offset Voltage : 3 mV
Supply Current : 20 mA
Package / Case : SO-16
Operating Supply Voltage : 4.5 V to 5.5 V
Bandwidth : 30 KHz


Specifications

• High common-mode rejection 25 kV/µs at V_CM = 1000 V provides precision and stability in high noise motor control environments
• ±5% gain tolerance provides accurate measurement in highly noisy motor control environments
• Advanced sigma-delta A/D converter technology ensures high precision
• Wide operating temperature range
• Integrated over-current and overload detection simplifies design

Description

The ACPL-785J isolation amplifier is designed for current sensing in electronic motor drives. In a typical implementation, motor currents flow through an external resistor and the resulting analog voltage drop is sensed by the ACPL-785J. A larger analog output voltage is created on the other side of the ACPL-785J's optical isolation barrier. The output voltage of ACPL-785J is proportional to the motor current and can be connected directly to a single-supply A/D converter. A digital over-range output (/FAULT) and an analog rectified output (ABSVAL) are also provided.

The wire OR-able over-range output (/FAULT) ACPL-785J is useful for quick detection of short circuit conditions on any of the motor phases. The wire-OR-able rectified output (ABSVAL), simplifies measure-ment of motor load since it performs polyphase rectification. Since the common-mode voltage swings several hundred volts in tens of nanoseconds in modern electronic motor drives, the ACPL-785J was designed to ignore very high common-mode transient slew rates (10 kV/s).

±3% gain tolerance part (HCPL-788J) is also available