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| 型號(hào)： | AN-20 |
| 英文描述： | Transient Suppression Techniques for TOPSwitch Power Supplies |
| 中文描述： | 暫態(tài)的TOPSwitch電源抑制技術(shù) |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 112K |
| 代理商： | AN-20 |
AN-20
A
6/96
4
Figure 7 shows a typical 2-wire input
TOPSwitch
ST202A
power supply modified with Y2-safety capacitors C7, C8, and
C11. The schematic is drawn to emphasize that C7, C8, and C11
should connect directly to the transformer pins. This capacitor
connection keeps peak transient currents flowing through known
paths and out of sensitive PC traces. Note that C11 connects to
the high voltage DC bus (V+), C7 connects to the high voltage
DC bus return (V-), and C8 connects directly to secondary
return. C7, C8, and C11 must have very short leads and be
connected with short, wide traces.
PI-1706-120495
7.5 V
RTN
C5
47
μ
F
D2
UG8BT
R2
68
R6
270
to 620
VR2
1N5995B
6.2 V
C3
120
μ
F
25 V
T1
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE150
BR1
400 V
C1
33
μ
F
400 V
C11
2.2 nF
Y2
R1
39
U2
NEC2501-H
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
X2
L2
22 mH
L
N
T1202
1
8
2
7
3
4
C8
2.2 nF
Y2
C7
2.2 nF
Y2
D3
IN4148
V+
V-
Figure 7. Modified ST202A Power Supply, 2-Wire Input.
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