Photocouplers boost accuracy with delta-sigma ADC

Two digital output isolation amplifiers for current and voltage sensing in power converters, the TLP7830 and TLP7930, achieve high accuracy through the inclusion of a delta sigma ADC, claims Toshiba.

Monitoring the phase current of motors and BUS voltage fluctuations provides feedback to microcontrollers in factory automation equipment, to achieve high-precision operation. The delta sigma ADC at the input side enables the photocouplers to achieve a high level of linearity of 4LSB (typical) at intergrity non linearity.

Both provide a guaranteed common mode transient immunity of 20kV/micro seconds (typical at VCM=1kV, Ta=25˚C). This enables stable operation in electrically noisy environment, says the company, for motor control applications. The optical barrier guarantees an isolation voltage of 5000V rms (minimum). The devices support a wide operating temperature range of -40 to +105˚C.

 Two package types are available. TLP7930 is supplied in an industry-standard DIP8 package and the TLP7830 is available in a compact SO8L package, which takes up 30% less board space and features a 40% lower profile.

 http://toshiba.semicon-storage.com

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