U208 TEMIC Semiconductors, U208 Datasheet - Page 5

• Manufacturer Part Number: U208
• Description: Open Loop Phase Control Circuit
• Manufacturer: TEMIC Semiconductors

TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
Design Calculations for Mains Supply
The following equations can be used for evaluating the
series resistor R
R
R
where:
V
V
I
I
I
I
R
tot
S
p
x
1
1max
1min
M
S
95 10302
95 10317
can be easily evaluated from figures 6 and 8
= Mains voltage
= Supply voltage on Pin 4
= Total DC current requirement of the circuit
= I
= Current requirement of the IC in mA
= Average current requirement of the triggering
= Current requirement of other peripheral
+
+
pulses
components
240
200
160
120
S
80
V
0.85
0
6
5
4
3
2
1
0
+ I
Mmax
0
0
p
10nF
2 I
+ I
– V
1
Smax
x
V
for worst case conditions:
0.2
Mains Supply
3
Mmin
Mmin
4.7nF
2 I
– V
Figure 4.
Figure 5.
tot
0.4
6
R
I
P(
tot
Smax
ö
Phase Control
Reference Point Pin 2
R1max
( M
( mA )
W
2.2nF
0.6
9
)
)
+
C
ö
(V
/t
=1.5nF
0.8
12
Mmax
2 R
– V
1.0
15
1
Smin
)
2
95 10316
95 10313
95 10315
100
80
60
40
20
50
40
30
20
10
6
5
4
3
2
1
0
0
0
0
0
0
1.4V
200
10
4
V
Figure 6.
Figure 7.
Figure 8.
GT
400
= 0.8V
I
R
R
tot
GT
1
20
8
( k
( mA )
(
Mains Supply
W
W
600
Mains Supply
)
)
Pulse Output
U208B
30
12
800
1000
40
16
5 (7)