U208B Ver la hoja de datos (PDF) - Temic Semiconductors
Número de pieza
componentes Descripción
fabricante
U208B Datasheet PDF : 7 Pages
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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
3
6
9
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
40
R1 ( kW )
Figure 6.
100
Pulse Output
80
60
40
1.4V
20
VGT = 0.8V
0
0
95 10313
50
200 400 600
W RGT ( )
Figure 7.
800 1000
40
Mains Supply
30
20
10
0
0
95 10315
4
8
12
16
Itot ( mA )
Figure 8.
TELEFUNKEN Semiconductors
5 (7)
Rev. A1, 28-May-96
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