參數(shù)資料
型號(hào): AN-14
英文描述: TOPSwitch Tips. Techniques & Troubleshooting Guide
中文描述: TOPSwitch的提示。技術(shù)
文件頁數(shù): 20/28頁
文件大?。?/td> 246K
代理商: AN-14
AN-14
20
B
6/96
14. Soft Start
14.1 Optocoupler Feedback
Soft Start can be added to eliminate turn-on overshoot in
optocoupler feedback applications with a 4.7
μ
F to 47
μ
F
aluminum electrolytic capacitor (C
) placed across the shunt
element as shown in Figure 13. Soft start capacitor C
SS
increases optocoupler current during turn-on to limit the duty
cycle and slow down the rising output voltage. C
has minimal
effect on the control loop during normal operation. R2 discharges
soft start capacitor C
SS
when input power is removed.
Figure 13. Implementing Soft Start with Optocoupler Feedback.
7.5 V
RTN
D2
UG8BT
R2
68
VR2
1N5995B
6.2 V
C3
120
μ
F
25 V
C2
680
μ
F
25 V
R1
39
U2
NEC2501-H
L1
3.3
μ
H
PI-1278-010494
15 V
RTN
R2
200
1/2 W
D2
MUR610CT
C2
1000
μ
F
35 V
C3
120
μ
F
25 V
U2
TL431
R4
49.9 k
R5
10 k
C9
0.1
μ
F
R1
510
L1
3.3
μ
H
Css
+
Css
+
(a)
Detail from ST202A
(b)
Detail from ST204A
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