Description

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 flows through an external resistor and the resulting analog voltage drop is sensed by the isolation amplifer. A differential output voltage that is proportional to the current is created on the other side of the optical isolation barrier.

Specifications and features

• ±0.5% High Gain Accuracy (ACPL-C79B)
• –50 ppm/°C Low Gain Drift
• 0.4 mV Input Offset 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 (∑-∆) A/D Converter Technology
• Fully Differential 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

Application Scenarios

• 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

Comparison

Based on the specifications and features, the ACPL-C79B/C79A/C790 isolation amplifers have the following advantages and disadvantages:

• ±0.5% High Gain Accuracy

• –50 ppm/°C Low Gain Drift

• 0.4 mV Input Offset 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 (∑-∆) A/D Converter Technology

• Fully Differential 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

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