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Precision optical isolation amplifiers geared for voltage sensing

12 Jul 2012

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Avago Technologies has introduced a portfolio of optically-isolated voltage sensors based on sigma-delta modulation that is specifically optimized for voltage sensing. Touted as the industry's first, the optical isolation amplifiers are engineered for applications such as sensing voltages in electronic power conversion systems commonly found in motor drives, switching power supplies and renewable energy systems, as well as sensor interfaces such as NTC thermistor isolation in IGBT modules.

The ACPL-C87B, C87A, and C870 provide designers with a 2V input range and high 1GΩ input impedance. For general applications, the ACPL-C87A (±1% gain tolerance) and the ACPL-C870 (±3% gain tolerance) are recommended. For high-precision applications such as renewable energy inverters where it is important to accurately track the fluctuating (due to changing sun conditions) DC bus voltage and for high-performance servo and motor drives, the ACPL-C87B (±0.5% gain tolerance) can be used.

The voltage sensors feature a 1V/V unity gain with low gain drift of -35ppm/°C and nonlinearity is kept to within 0.1% max. The voltage sensors include an active-high shutdown pin which reduces the IDD1 current to only 15?A during standby, which makes the sensors well-suited for battery-powered and other power-sensitive applications.

The built-in reinforced safety insulation and high CMR (common mode rejection) performance of the devices prevents erroneous voltage measurements and ensures reliable operation in a noisy environment. The optically-isolated voltage sensors have a 15kV/µs common-mode transient immunity. Safety approvals include CSA and IEC/EN/DIN EN60747-5-5 with a VIORM of 1230 Vpeak. Additionally, the sensors are UL recognized with 5000Vrms for 1 minute per UL1577.

The ACPL-C87x voltage sensors are housed in stretched 8-lead SO-8 plastic packages with 8mm creepage and clearance that meet worldwide regulatory safety standards. The sensors also have an operating temperature range of -40°C to 105°C.

Samples and production quantities are available now.




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