The Broadcom® HCPL-7840 isolation amplifier family is 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).
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
Features:
- 15 kV/μs common-mode rejection at VCM = 1000V
- Compact, auto-insertable standard 8-pin DIP package
- 0.00025V/V/°C gain drift vs. temperature
- 0.3-mV input offset voltage
- 100-kHz bandwidth
- Advanced Sigma-Delta (Σ-Δ) A/D converter technology
- Fully differential circuit topology
- 0.8-μm CMOS IC technology
Package Includes:
1 x HCPL-7840-300E-BROADCOM -Optocoupler, Optically Isolated Amplifiers, 1 Channel, Surface Mount DIP, 8 Pins, 3.75 kV, 100 kHz
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