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| 型號： | AN-17 |
| 英文描述： | Flyback Transformer Design for TOPSwitch Power Supplies |
| 中文描述： | 回掃變壓器設(shè)計的TOPSwitch電源 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 133K |
| 代理商： | AN-17 |
June 1996
Flyback Transformer Design For
TOPSwitch
Power Supplies
Application Note AN-17
total flyback component cost is lower when compared to other
techniques. Between 75 and 100 Watts, increasing voltage and
current stresses cause flyback component cost to increase
significantly. At higher power levels, topologies with lower
voltage and current stress levels (such as the forward converter)
may be more cost effective even with higher component counts.
Flyback transformer design, which requires iteration through a
set of design equations, is not difficult. Simple spreadsheet
iteration reduces design time to under 10 minutes for a transformer
When developing
TOPSwitch
flyback power supplies,
transformer design is usually the biggest stumbling block.
Flyback transformers are not designed or used like normal
transformers. Energy is stored in the core. The core must be
gapped. Current effectively flows in either the primary or
secondary winding but never in both windings at the same
time.
Why use the flyback topology Flyback power supplies use the
least number of components. At power levels below 75 watts,
Figure 1. ST202A Power Supply Operates from Universal Input Voltage and Delivers 15 Watts.
PI-1787-021296
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
D1
UF4005
C2
680
μ
F
25 V
VR1
P6KE200
CIRCUIT PERFORMANCE:
Line Regulation - ±0.5%
(85-265 VAC)
Load Regulation - ±1%
(10-100%)
Ripple Voltage ± 50 mV
Meets VDE Class B
BR1
C1
33
μ
F
(CIN)
R1
39
U2
NEC2501-H
U1
TOP202YAI
DRAIN
SOURCE
CONTROL
C4
0.1
μ
F
C7
1000 nF
Y1
L1
3.3
μ
H
J1
C6
0.1
μ
F
L2
22 mH
L
N
IPRI
ISEC
VDIODE
VDRAIN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AN-18 | TOPSwitch Flyback Transformer Construction Guide |
| AN-19 | TOPSwitch Flyback Power Supply Efficiency |
| AN-20 | Transient Suppression Techniques for TOPSwitch Power Supplies |
| AN-22 | OBSOLETE when inventory is depleted. 10% tolerance no l |
| AN-23 | TinySwitch Flyback Design Methodology |
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