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TRIAC optocouplers lower standby power up to 2W

Posted: 28 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:TRIAC optocoupler?


Fairchild Semiconductor has released optically-isolated TRIAC drivers that offer industrial designers isolation solution that lowers standby power by up to 2W to meet stringent regulations such as the 1Watt Initiative and ENERGY STAR.

The FOD410, FOD4108, FOD4116 and FOD4118 series of zero-crossing TRIAC driver optocouplers, eliminates the RC-snubber network when used to drive a snubberless discrete power TRIAC, saving board space and energy needed to power this circuitry.

These snubberless TRIAC optocouplers have been designed to withstand high static and commutating dv/dt to protect against the high degree of noise found in noisy industrial environments. Static dv/dt immunity allows the device to remain in the blocking state in the presence of voltage transients, and commutating dv/dt immunity allows the device to turn off when the load voltage and current are out of phase with each other.

The optocouplers feature a guaranteed 10,000V/?s minimum rating for both commutating and static dv/dt. Most of the alternative solutions in the market usually guarantee minimum static dv/dt immunity with no performance guarantees for commutating dv/dt. The FOD41xx devices are zero-crossing TRIAC driver optocouplers, which restrict the optocoupler from turning on only when the AC voltage is near zero, further improving dv/dt immunity.

In addition, the high performance optocouplers deliver robust isolation interface to ensure low transmission error rates and strong reliability for noisy industrial environments. Fairchild's FOD42xx random phase snubberless TRIAC driver family complements this new offering of TRIAC drive optocouplers and provides equivalent noise immunity and power saving opportunities without the zero-crossing inhibit circuit.

The FOD41xx series of devices utilize Pb-free terminals and have been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. All of Fairchild's products are designed to meet the requirements of the European Union's RoHS Directive.

Pricing for the FOD410, FOD4108, FOD4116 and FOD4118 are $1.29, $1.43, $1.43 and $1.86 each, respectively, in 1,000 pieces. Samples are available now. Delivery is eight weeks ARO.

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