Optically-coupled digital output isolation amplifiers

July 07, 2016 // By Graham Prophet
Comprising a high accuracy photocoupler plus delta-sigma A/D converter, these digital output isolation amplifiers from Toshiba are intended for current and voltage sensing in power converters.

Accurately monitoring the phase current of motors and bus voltage fluctuations is essential when providing feedback to the microcontrollers used in factory automation equipment if they are to achieve high-precision operation. To meet these requirements, Toshiba has equipped the TLP7830 and TLP7930 devices with a delta sigma ADC at the input side that enables the devices to achieve a high level of linearity of 4 LSB (typ.) INL (integral non-linearity).

TLP7830 and TLP7930 provide a guaranteed common mode transient immunity of 20 kV/ µsec (typical @VCM = 1 kV, Ta = 25˚C); this enables stable operation in electrically noisy environments such as motor control applications. The optical barrier guarantees an isolation voltage of 5000 Vrms (minimum). The devices have been designed to support a wide operating temperature range of -40˚C to +105˚C.

 

A choice of two package types is 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.

 

Toshiba Electronics Europe; www.toshiba.semicon-storage.com