Avago ACPL-782T汽车用小型绝缘放大方案
Avago 公司的ACPL-782T是汽车用小型绝缘放大器,适用于马达驱动和电池系统监测的电压和电流检测.ACPL-782T采用先进的Delta-Sigma ADC技术,增益误差±2%,增益漂移30ppm/℃,输入失调电0.3mV,100kHz带宽,非线性0.004%.本文介绍ACPL-782T主要特性,功能方框图以及输入失调电压, 增益和非线性和传输时延测试电路图, 电压检测和温度检测应用电路图.
ACPL-782T-000E: Plastic Automotive Miniature Isolation Amplifier
The ACPL-782T isolation amplifier was designed for voltage and current sensing in electronic motor drives and battery system monitoring. In a typical implementation, and motor currents flow through an external resistor and the resulting analog voltage drop is sensed by the ACPL-782T. A differential output voltage is created on the other side of the ACPL-782T optical isolation barrier. This differential output voltage is proportional to the motor current and can be converted to a single-ended signal by using an op-amp as shown in the recommended application circuit. Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the ACPL-782T was designed to ignore very high common-mode transient slew rates (of at least 10 kV/μs).
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