آی سی تقویت کننده ایزوله HCPL7840 پکیج SOP8

The HCPL-7840 isolation amplifier 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).

The product can also be used for general analog signal isolation applications requiring high accuracy, stability, and linearity under similarly severe noise conditions.

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

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

Compact, auto-insertable standard 8-pin

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 differential circuit topology

0.8 μm CMOS IC technology