Description

The integrated circuit, U217B, is designed as a zero voltage switch in bipolar technology. It is used to control resistive loads at mains by a triac in zero-crossing mode. A ramp generator allows to realize power control function by period group control, whereas full wave logic guarantees that full mains cycles are used for load switching.

Features


Direct supply from the mains


Current consumption ≤0.5 mA


Very few external components


Full wave drive – no dc current component in the load circuit


Negative output current pulse typ. 100 mA – short circuit protected


Simple power control


Ramp generator


Reference voltage

Applications


Full wave power control


Temperature regulation


Power blinking switch