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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)計技術(shù) |
| 文件頁數(shù)： | 23/36頁 |
| 文件大?。?/td> | 381K |
| 代理商： | AN-15 |
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Enhanced EMI filter design for Video Applications and
Reduced Radiated Emissions
Figures 41 and 42 show typical EMI filters for 2-wire input
video applications (such as television set-top cable and satellite
decoders). These techniques can also reduce radiated emissions
by keeping high frequency conducted emission currents (30
MHz to 200 MHz) out of the power cable which may act like an
antennae and broadcast radiated emissions.
PI-1653-111695
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
CA
1000 pF
500 V
1000 pF
1
V-
V+
8
2
7
3
4
Figure 41. Typical 2-Wire TOPSwitch Power Supply and EMI Filter for Video Applications and Reduced Radiated Emissions.
Figures 41 and 42 both show a low cost, ceramic, 1000 pF
capacitor across output diode D2 to help control dv/dt and diode
ringing voltages. Higher output voltages may require
reducing
the size of the capacitor and increasing the voltage rating.
In Figure 41, another 1000 pF, 500 V capacitor (CA) is added
in parallel with input energy storage capacitor C1 for high
frequency bypass in the 30 MHz to 200 MHz range. This
additional capacitor should be placed directly from
TOPSwitch
source pin to transformer V+ pin.
Figure 42 shows an alternate circuit using three Y2-capacitors
to balance the high frequency common mode impedance to V+
and V-. Note that two Y2-capacitors (CA and C7) are essentially
in series and effectively provide high frequency bypass across
C1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AN-16 | TOPSwitch Flyback Design Methodology |
| AN-17 | Flyback Transformer Design for TOPSwitch Power Supplies |
| AN-18 | TOPSwitch Flyback Transformer Construction Guide |
| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
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