U217B
Description
The integrated circuit, U217B, is designed as a zerovoltage switch in bipolar technology. It is used to control resistive loads at mains by a triac in zero-crossing mode.
A ramp generator allows power control function by period group control, whereas full-wave logic guarantees that full mains cycles are used for load switching.
Features
D Direct supply from the mains
D Current consumption ≤ 0.5 m A
D Very few external ponents
D Full-wave drive
- no DC current ponent in the load circuit
D Negative output current pulse typ. 100 m A
- short-circuit protected
D Simple power control D Ramp generator D Reference voltage
Applications
D Full-wave power control D Temperature regulation D Power blinking switch
Block Diagram
220 k W R2 (250 V~) (Rsync)
D1 BYT86/800
R1
18 k W/ 2W
Load 1000 W
C2
2.2 m F/ 10 V
R4 100 k W
R5 15 k W max
100 k W min
R6 58 k W
1 Ramp generator
8 Synchronization
+
4+
Full-wave...
