HCPL-7840 Datasheet PDF - AVAGO Technologies

●Description

●The HCPL-7840 isolation amplifer family was designed for current sensing in electronic motor drives. In a typical implementation, motor currents flow through an external resistor and the resulting analog voltage drop is sensed by the HCPL-7840. A differential output voltage is created on the other side of the HCPL-7840 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 HCPL-7840 was designed to ignore very high common mode transient slew rates (of at least 10 kV/μs).

●Features

●• 15 kV/μs common-mode rejection at VCM = 1000 V

●• Compact, auto-insertable standard 8-pin DIP package

●• 0.00025 V/V/°C gain drift vs. temperature

●• 0.3 mV input offset voltage

●• 100 kHz bandwidth

●• 0.004% nonlinearity

●• Worldwide safety approval:

●    UL 1577 (3750 Vrms/1 min.)

●    and CSA, IEC/EN/DIN EN 60747-5-2

●• Advanced Sigma-Delta (∑-Δ) A/D converter technology

●• Fully differential circuit topology

●• 0.8 μm CMOS IC technology

●Applications

●• Motor phase and rail current sensing

●• Inverter current sensing

●• Switched mode power supply signal isolation

●• General purpose current sensing and monitoring

●• General purpose analog signal isolation