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參數資料
| 型號： | U208 |
| 英文描述： | Open Loop Phase Control Circuit |
| 中文描述： | 開環相位控制電路 |
| 文件頁數： | 5/7頁 |
| 文件大小： | 85K |
| 代理商： | U208 |
U208B
TELEFUNKEN Semiconductors
Rev. A1, 28-May-96
5 (7)
0
0.2
0.4
0.6
0.8
0
80
120
160
200
240
P
R ( M )
1.0
95 10302
°
10nF
4.7nF
Phase Control
Reference Point Pin 2
2.2nF
C
/t
=1.5nF
Figure 4.
0
3
6
9
12
0
1
2
3
4
6
P
(
I
tot
( mA )
15
95 10317
Mains Supply
5
Figure 5.
Design Calculations for Mains Supply
The following equations can be used for evaluating the
series resistor R
1
for worst case conditions:
V
Mmin
– V
Smax
2 I
tot
V
Mmax
– V
Mmin
2 I
Smax
where:
V
M
= Mains voltage
V
S
= Supply voltage on Pin 4
I
tot
= Total DC current requirement of the circuit
= I
S
+ I
p
+ I
x
I
S
= Current requirement of the IC in mA
I
p
= Average current requirement of the triggering
pulses
I
x
= Current requirement of other peripheral
components
R
1
can be easily evaluated from figures 6 and 8
R
1max
0.85
R
1min
P(
R1max
)
(V
Mmax
– V
Smin
)
2
2 R
1
0
10
20
30
R
1
( k )
40
95 10316
Mains Supply
0
1
2
3
4
6
P
(
5
Figure 6.
0
200
400
600
800
0
20
40
60
80
100
I
G
R
GT
( )
1000
95 10313
Pulse Output
V
GT
= 0.8V
1.4V
Figure 7.
0
4
8
12
0
10
20
30
40
50
R
1
I
tot
( mA )
16
95 10315
Mains Supply
Figure 8.
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