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Open Loop Phase Control Circuit

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Open Loop Phase Control Circuit
U208B
Description
The integrated circuit, U208B, is designed as a phase con-
trol circuit in bipolar technology with internal
supply-voltage monitoring. As the voltage is built up, un-
controlled output pulses are avoided by internal
monitoring. Furthermore, it has internal-current and volt-
age synchronisation. It is recommended as a low cost
open-loop control.
Features
D Automatic retriggering
D Triggering pulse typ. 125 mA
D Voltage and current synchronisation
D Internal supply voltage monitoring
D Current requirement 2.5 mA
Package: DIP8
Block Diagram
R3
220 kW/
0.5 W
7
R4
470 kW/
0.5 W
8
Voltage Current
detector detector
Automatic
retriggering
BYT77
18 kW/
2W
D1
M
R1
L
95 11224
Output
pulse
3
R7
180 W
TIC
236N
VM =
230 V ~
R2
180 kW
R6
18 kW
100 kW
R5
120 kW
4
6
Phase
control unit
ö = f (V6)
Supply
voltage
limitation
Voltage
monitoring
10 nF
5
C2
2
–VS
1
C1
GND
22 mF/
25 V
N
Figure 1. Block diagram for simple phase control system
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
1 (7)
TEMIC Semiconductors
TEMIC Semiconductors



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