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