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High Voltage Isolator Meets Creepage Requirements of Medical Industry

Thu, 07/01/2010 - 10:48am
High Voltage Isolator Meets Creepage Requirements of Medical Industry

TT electronics OPTEK Technology has developed a Photologic optically coupled isolator providing medical electronics design engineers with a high voltage device that meets industry creepage requirements. Designated OPI127-032, the isolator provides more than 16KV isolation and meets IEC requirements for 32mm creepage distance.

The optically coupled isolator is ideal for separating high voltage from sensitive low-voltage logic circuitry in the controllers of electro scalpels, defibrillators, and oncology devices.

The OPI127-032 device consists of an optically coupled isolator with a gallium arsenide infrared emitting diode coupled to a monolithic integrated circuit. The circuit incorporates a photodiode, a linear amplifier and a Schmitt trigger on a single silicon chip.

OPTEK’s High Voltage Isolator Provides more than 16KV Isolation.

For maximum long-term stability, both the diode and the Photologic sensor are hermetically sealed in separate packages and then mounted in a high dielectric plastic housing. The isolator features an inverted totem pole output and TTL/LSTTL compatible logic level output capable of driving up to 8 TTL loads directly without additional circuitry.

Data rates are to 250 kBaud, with typical rise and fall times of 70 ns. The input diode features a forward DC current of 25mA, reverse DC voltage of 2V and power dissipation of 200mW. Maximum forward voltage (VF) is 1.5V and reverse current (IR) is 100µA. Power dissipation for the output photosensor is 120mW/°C, maximum operating supply voltage (VCC) is 5.5V and maximum supply current (ICC) is 20mA.

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