ACPL-C79A-000E

The ACPL-C79A isolation amplifiers aredesigned for current and voltage sensing in electronicpower converters in applications including motor drivesand renewable energy systems. In a typical motor driveimplementation, current flows through an externalresistor and the resulting analog voltage drop is sensed bythe isolation amplifier. A differential output voltage that isproportional to the current is created on the other side ofthe optical isolation barrier.For general applications, the ACPL-C79A (±1% gaintolerance) and the ACPL-C790 (±3% gain tolerance)are recommended. For high precision applications, theACPL-C79B (±0.5% gain tolerance) can be used. Theproduct operates from a single 5 V supply and providesexcellent linearity and dynamic performance of 60 dB SNR.With 200 kHz bandwidth, 1.6 µs fast response time, theproduct captures transients in short circuit and overloadconditions. The high common-mode transient immunity(15 kV/µs) of the ACPL-C79B/C79A/C790 provides theprecision and stability needed to accurately monitormotor current in high noise motor control environments,providing for smoother control (less “torque ripple”) invarious types of motor control applications.Combined with superior optical coupling technology, theACPL-C79B/C79A/C790 implements sigma-delta (?-?)analog-to-digital converter, chopper stabilized amplifiers,and a fully differential circuit topology to provideunequaled isolation-mode noise rejection, low offset,high gain accuracy and stability. This performance isdelivered in a compact, auto-insertable Stretched SO-8(SSO-8) package that meets worldwide regulatory safetystandards.

• ±0.5% High Gain Accuracy (ACPL-C79B)
• –50 ppm/°C Low Gain Drift
• 0.6 mV Input Offset Voltage
• 0.05% Excellent Linearity
• 60 dB SNR
• 200 kHz Wide Bandwidth
• 3 V to 5.5 V Wide Supply Range for Output Side
• –40°C to +105°C Operating Temperature Range
• Advanced Sigma-Delta (?-?) A/D Converter Technology
• Fully Differential Isolation Amplifier
• 15 kV/µs Common-Mode Transient Immunity
• Compact, Auto-Insertable Stretched SO-8 Package
• Safety and Regulatory Approvals:
  • IEC/EN/DIN EN 60747-5-5: 1414 Vpeak working insulation voltage
  • UL 1577: 5000 Vrms/1min double protection rating
  • CSA: Component Acceptance