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PDF U208 Data sheet ( Hoja de datos )
| Número de pieza | U208 | |
| Descripción | Open Loop Phase Control Circuit | |
| Fabricantes | TEMIC Semiconductors | |
| Logotipo |  |
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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)
1 page  
240
200
10nF 4.7nF
160
Phase Control
Reference Point Pin 2
2.2nF
120
80 C ö/t=1.5nF
0
0
95 10302
6
0.2 0.4 0.6
Rö ( MW )
Figure 4.
0.8 1.0
5
Mains Supply
4
3
2
1
0
0
95 10317
369
Itot ( mA )
Figure 5.
12 15
Design Calculations for Mains Supply
The following equations can be used for evaluating the
series resistor R1 for worst case conditions:
+R1max 0.85
VMmin – VSmax
2 Itot
+R1min
VMmax – VMmin
2 ISmax
+P(R1max)
(VMmax – VSmin)2
2 R1
where:
VM = Mains voltage
VS = Supply voltage on Pin 4
Itot = Total DC current requirement of the circuit
= IS + Ip + Ix
IS = Current requirement of the IC in mA
Ip = Average current requirement of the triggering
pulses
Ix = Current requirement of other peripheral
components
R1 can be easily evaluated from figures 6 and 8
U208B
6
5
4
3
2
1
0
0
95 10316
Mains Supply
10 20 30
R1 ( kW )
40
Figure 6.
100
Pulse Output
80
60
40
1.4V
20
VGT = 0.8V
0
0
95 10313
50
200 400 600
WRGT ( )
Figure 7.
800 1000
40
Mains Supply
30
20
10
0
0
95 10315
4 8 12
Itot ( mA )
Figure 8.
16
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
5 (7)
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet U208.PDF ] | |
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