Description

The HCPL-7520 isolated linear current sensing IC family is designed for current sensing in low-power electronic motor drives. In a typical implementation, motor current flows through an external resistor and the resulting analog voltage drop is sensed by the HCPL-7520. An output voltage is created on the other side of the HCPL- 7520 optical isolation barrier. This single-ended output voltage is proportional to the motor current. Since common-mode voltage swings of several hundred volts in tens of nanoseconds are common in modern switching inverter motor drives, the HCPL-7520 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 8-pin DIP package

• 60 ppm/°C gain drift vs. temperature

• –0.6 mV input offset voltage

• 8 µV/°C input offset voltage vs. temperature

• 100 kHz bandwidth

• 0.06 non-linearity, single-ended amplifer output for low power application.

• Worldwide safety approval: UL 1577 (3750 Vrms/1 min.), CSA and IEC/EN/DIN EN 60747-5-2 (Option 060 only)

• Advanced sigma-delta (Σ−∆) A/D converter technology

Applications

• Low-power inverter current sensing

• Motor phase and rail current sensing

• Switched mode power supply signal isolation

• General purpose low-power current sensing and monitoring

• General purpose analog signal isolation