Description

The ACPL-C78A/C780/C784 family of isolation amplifers 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-C78A/C780/C784. A differential output voltage is created on the other side of the ACPL-C78A/C780/C784 optical isolation barrier. This differential output voltage is proportional to the motor current and can be converted to a single-ended signal by using an op-amp as shown in the recommended ap plication circuit. Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the ACPL-C78A/C780/C784 is designed to ignore very high common-mode transient slew rates (of at least 10 kV/μs).

Features

• 15 kV/μs Common-Mode Rejection at VCM = 1000 V

• Compact, Auto-Insertable Stretched SO-8 Package

• 0.00025 V/V/°C Gain Drift vs. Temperature

• 0.3 mV Input Offset Voltage

• 100 kHz Bandwidth

• 0.004 Nonlinearity

• Worldwide Safety Approval: UL 1577 (5000 Vrms/1 min.),

CSA and IEC/EN/DIN EN 60747-5-5

• Advanced Sigma-Delta (∑-∆) A/D Converter Technology

• Fully Differential Amplifer

Applications

• Motor Phase and Rail Current Sensing

• Inverter Current Sensing

• DC bus voltage sensing

• General Purpose Current Sensing and Monitoring

• General Purpose Analog Signal Isolation