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| 型號： | AN-15 |
| 英文描述： | TOPSwitch Power Supply Design Techniques for EMI & Safety |
| 中文描述： | 的TOPSwitch電源電磁干擾設(shè)計(jì)技術(shù) |
| 文件頁數(shù)： | 27/36頁 |
| 文件大小： | 381K |
| 代理商： | AN-15 |
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AN-15
27
Figure 46 shows a typical 2 wire implementation with the
enclosure shield at primary potential (usually connected to the
TOPSwitch
Source pin). This technique is used for partial
enclosures (which may actually be the
TOPSwitch
heat sink)
which are safely isolated from the SELV output voltages. PC
board creepage distance between primary connected shield and
the circuits connected to SELV output voltages must meet
reinforced insulation requirements. The enclosure is AC coupled
with a small reinforced insulation, Y1-capacitor (C7) back to
SELV output circuitry. Another common approach is to use a
series combination of two Y2-safety capacitors which meets
electrical safety requirements because each capacitor will safely
limit fault current to under 250
μ
A (IEC950 limit for two wire,
250 VAC) if the other capacitor fails short.
PI-1655-111695
7.5 V
RTN
C5
47
μ
F
D2
UG8BT
D3
1N4148
R2
68
VR2
1N5995B
6.2 V
C3
120
μ
F
25 V
T1
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE200
BR1
400 V
C1
33
μ
F
400 V
R1
39
U2
NEC2501-H
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
C7
1.0 nF
Y1
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
X2
L2
22 mH
L
N
1
V+
V-
8
2
7
3
4
Figure 46. Typical 2-Wire TOPSwitch Power Supply and EMI Filter with Primary Connected Partial Shield.
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| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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