ACPL-C79A-500E

The ACPL-C79B/C79A/C790 isolation amplifers are designed for current and voltage sensing in electronic power converters in applications including motor drives and renewable energy systems. In a typical motor drive implementation, current fows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifer. A diferential output voltage that is proportional to the current is created on the other side of the optical isolation barrier. For general applications, the ACPL-C79A (±1% gain tolerance) and the ACPL-C790 (±3% gain tolerance) are recommended. For high precision applications, the ACPL-C79B (±0.5% gain tolerance) can be used. The product operates from a single 5 V supply and provides excellent linearity and dynamic performance of 62 dB SNR. With 200 kHz bandwidth, 1.6 μs fast response time, the product captures transients in short circuit and overload conditions. The high common-mode transient immunity (15 kV/μs) of the ACPL-C79B/C79A/C790 provides the precision and stability needed to accurately monitor motor current in high noise motor control environments, providing for smoother control (less “torque ripple”) in various types of motor control applications. Combined with superior optical coupling technology, the ACPL-C79B/C79A/C790 implements sigma-delta (Σ - Δ) analog-to-digital converter, chopper stabilized ampli­ fers, and a fully diferential circuit topology to provide unequaled isolation-mode noise rejection, low ofset, high gain accuracy and stability. This performance is delivered in a compact, auto-insertable Stretched SO-8 (SSO-8) package that meets worldwide regulatory safety standards.

Applications

• Current/Voltage Sensing in AC and Servo Motor Drives
• Solar Inverters, Wind Turbine Inverters
• Industrial Process Control
• Data acquisition systems
• Switching Power Supply Signal Isolation
• General Purpose Analog Signal Isolation
• Traditional Current Transducer Replacements

Key features

• ±0.5% High Gain Accuracy (ACPL-C79B)
• -50 ppm/°C Low Gain Drift
• 0.4 mV Input Ofset Voltage
• 0.05% Excellent Linearity
• 62 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 (Σ - Δ) A/D Converter Technology
• Fully Diferential Isolation Amplifer
• 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 Notice #5