Texas Instruments SN6501DBVR | Demoboard TIDA-00445

Description

The TIDA-00445 TI design provides a reference solution for isolated current measurement using shunt and isolated amplifier. By limiting the shunt voltage to 25mV, this design is able to reduce power dissipation in the shunt and achieves a high current measurement range of up to 200A. Shunt voltage is further amplified by precision Opamps in instrumentation amplifier based configuration with a gain of 10 to match the input range of isolation amplifier. The output of isolation amplifier is level shifted and scaled to utilize the complete input range of 3.3v ADC. This design uses free running transformer driver for generating isolated supply voltage for the high voltage side of the circuit. Small form factor for the power supply is achieved by the operation of driver at 400 KHz.

Features

Shunt based isolated 200Apk current measurement solutionLimiting shunt voltage to 25mV helps achieving less power dissipationHigh-Side Current Sense Circuit With High Common Mode Voltage of 1200 V peak Supporting up to 690V AC Mains Powered DrivesCalibrated AC accuracy of <1% across temperatures -25˚c to +85˚cCan be Interfaced directly with differential or single ended ADCSmall form factor push pull based isolated power supply to power high side circuitInbuilt 1.65VREF for level shifting the output.

Typical applications

• Active Front-End Converters
• Variable Speed Drives
• UPS

More information

• Datasheet
• IC product information