The ACPL-C78A is a precision isolation amplifier from Avago Technologies, designed for accurate current and voltage sensing in electronic power conversion systems. It provides galvanic isolation between the input and output, protecting sensitive control circuitry from high voltages and noise. This isolation amplifier offers excellent linearity, low offset drift, and a wide bandwidth, making it suitable for demanding applications.

Applications

• Current sensing in motor drives
• Voltage sensing in power inverters
• Power supply feedback control
• Renewable energy systems (solar, wind)
• Industrial automation
• Isolated data acquisition

Features

• High accuracy: ±0.5% gain tolerance
• Low offset drift: ±5 μV/°C
• Wide bandwidth: 200 kHz
• Galvanic isolation: VIORM = 891 Vpeak
• High common-mode transient immunity (CMTI): 20 kV/µs
• Operating temperature range: -40°C to +105°C
• Safety approvals: UL, CSA, IEC/EN/DIN EN 60747-5-5

Benefits

• Accurate current and voltage measurements for improved system performance.
• Stable operation over temperature due to low offset drift.
• Wide bandwidth allows for capturing fast transient signals.
• Enhanced safety with galvanic isolation, protecting sensitive circuitry from high voltages.
• Reliable operation in noisy environments due to high common-mode transient immunity.
• Wide operating temperature range for use in diverse environments.

The ACPL-C78A utilizes sigma-delta modulation and chopper amplification techniques to achieve high accuracy and stability. The input signal is converted into a digital bitstream, which is then transmitted across the isolation barrier. The output is reconstructed using a precision digital-to-analog converter, providing an accurate representation of the input signal. The galvanic isolation is achieved through the use of optical coupling, ensuring a high level of safety and noise immunity. The ACPL-C78A is a crucial component in various power conversion and measurement systems, enabling accurate and reliable monitoring of current and voltage signals.