Zero-Voltage Switch
Description
Zero-Voltage Switch with adjustable Ramp
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 mA
D Very few external components
D Full-wave drive – no DC current component in the load circuit
D Negative output current pulse typ.
100 mA – 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 kW R2 (250 V~) (Rsync)
D1 BYT86/800
R1
18 kW/ 2W
Load 1000 W
L
C2
2.
2 mF/ 10 V
R4 100 kW
R5 15 kW
max
100 kW min
R6 58 kW
2
1 Ramp generator
8 Synchronization
3
+
4+
Full-wave logi...
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