Phototriacs provide off-line control of AC voltages

16 November 2005 Opto-Electronics

Vishay Intertechnology has released the VO3062 and VO3063, two new zero-crossing 1,5 kV/μs dV/dt phototriacs designed to isolate low-voltage logic from AC voltages up to 380 V.

The phototriacs consist of a GaAs infrared LED that is optically coupled to a monolithic photosensitive zero crossing triac detector chip. A low-input trigger current facilitates an easy interface with microcontrollers and digital logic. The VO3063 requires a maximum trigger current of 5 mA to latch output, the VO3062 requires 10 mA. The devices are available in 6-pin DIP, 400-mil DIP, and SMD packages.

Rated with a 600 V blocking voltage, the phototriacs can provide isolation between DC and AC voltages on 120 V, 240 V, and 380 V a.c. lines, giving designers a 2X or better safety factor for control of off-line voltages up to 240 V. The VO3062 and VO3063 are designed for control of resistive, inductive, or capacitive loads including motors, solenoids, high-current thyristors, and relays.

Optimised for noisy environments, typical applications for the new devices include refrigerators, airconditioners, dishwashers, vending machines, industrial controls, AC motor drives, switches, switching power supplies, and solenoid/valve controls.

For more information www.vishay.com

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