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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電源電磁干擾設計技術 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 381K |
| 代理商： | AN-15 |
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AN-15
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6/96
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PI-1654-111695
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
2.2 nF
Y2
L1
3.3
μ
H
F1
3.15 A
J1
C6
0.1
μ
F
X2
L2
22 mH
L
N
1
8
2
2.2 nF
Y2
7
3
4
C8
2.2 nF
Y2
1000 pF
CA
V+
V-
Figure 43. Low Power (Below 5W) TOPSwitch Supply Using Discrete Normal Mode Chokes.
Figure 42. 2-Wire TOPSwitch Power Supply and EMI Filter with Three Y-Capacitors For Video Applications and Reduced Radiated
Emissions.
PI-1652-111695
5 V
RTN
U1
D4
1N5822
D3
1N4148
C5
47
μ
F
10 V
L1
(Bead)
C2
330
μ
F
25 V
C3
150
μ
F
25 V
C7
1.0
μ
F
Y1
T1200
D2
UF4005
D1
BZT03-C200
200 V
1.5 W
R1
22
C4
2.2
μ
F
400 V
0.047 μ
F
X2
BR1
400V
C6
1 mH
L2
1 mH
L3
1
8
5
4
3
2
T1
L
N
C1
2.2
μ
F
400 V
D
C
S
S
TOP
210
V+
V-
Alternative Filter Approach Without Common Mode Choke
An alternative filter for lower power (below 5 watt) applications
is shown in Figure 43. This filter splits the high voltage energy
storage capacitor to create a filter. Peak current in L2 and L3 is
approximately half the peak current in bridge rectifier BR1 due
to capacitor C1. Differential mode attenuation is provided by
C1, C4, L2, and L3. The secondary is AC coupled back to the
primary by Y1-safety capacitor C7. Note that C7 can be
replaced by two series connected Y2-safety capacitors with
twice the value as shown.
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|---|---|
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| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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