Document
TELEFUNKEN Semiconductors
U 217 B / U 217 B–FP
Zero Voltage Switch / Temperature Control for General Applications
Technology: Bipolar
Features
D Direct supply from the mains
D Current consumption ≤ 0.5 mA
D Very few external components
D Full wave drive – no d.c. 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
Case: DIP 8, SO 8
Figure 1 Block diagram and pin connections
Preliminary Information
1
U 217 B / U 217 B–FP
TELEFUNKEN Semiconductors
Figure 2 Typical circuit — Period group control 0 ... 100 %
General Description
Integrated circuit, U 217 B, is a triac controller for zero crossing mode. It is meant to control power in switching resistive loads of mains supply.
Informations regarding supply sync. is provided at Pin 8 via resistor RSync.
To avoid d.c. load on the mains, full wave logic guarantee that complete mains cycles are used for load .