深圳市华之电科技有限公司

 HCPL-7840-000E

 HCPL-7840-000E

 HCPL-7840-000E

 HCPL-7840-000E

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 off set 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 diff erential 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

Description

The HCPL-7840 isolation amplifi er family was designed

for current sensing in electronic motor drives. In a typical

implementation, motor currents fl ow through an external

resistor and the resulting analog voltage drop is sensed by

the HCPL-7840. A diff erential output voltage is created on

the other side of the HCPL-7840 optical isolation barrier.

This diff erential 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.