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| 型號(hào)： | AN-16 |
| 英文描述： | TOPSwitch Flyback Design Methodology |
| 中文描述： | TOPSwitch的反激式設(shè)計(jì)方法 |
| 文件頁(yè)數(shù)： | 10/32頁(yè) |
| 文件大小： | 247K |
| 代理商： | AN-16 |
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AN-16
A
6/96
10
Step 28. to Step 29.
Add output LC post filter if and only if output switching ripple voltage is not within specification:
Inductor L: 2.2 to 4.7
μ
H. Use ferrite bead for low current (
≤
1A) output and standard off the shelf choke for higher current
output. Increase choke current rating or wire size if necessary to avoid significant DC voltage drop.
Capacitor, C:
120uF, 35V, low ESR electrolytic
United Chemicon LXF35VB121M8X12LL
Nichicon UPL1V121MRH
Panasonic ECA-1VFQ121L
Step 30.
Select bias rectifier per Table 9 such that V
R
≥
1.25 x PIV
B
; where PIV
B
is from Step 24 and V
R
is the rated reverse
voltage of the rectifier diode.
Step 31.
Select bias capacitor:
Use 0.1uF, 50V, ceramic
Step 32.
Select Control pin capacitor and series resistor:
Control pin capacitor: use 47uF, 10V, low cost electrolytic (Do not use low ESR capacitor).
Series resistor: use 6.2
, 1/4 Watt
(Not needed if K
RP
= 1, e.g. discontinuous mode).
Step 33.
Select feedback circuit components according to applicable Reference Design: RD1, ST202A, ST204A.
Applicable reference design: identified in Step 2.
Detailed component information: refer to appropriate reference design board documentation.
Step 34.
Select input bridge rectifier such that:
V
R
≥
1.25 x (1.414 x V
ACMAX
); where V
ACMAX
is from Step 1.
I
ACRMS
≥
2 x I
D
; where I
D
ACRMS
is the input RMS current.
Note:
I
P
V
PF
ACRMS
O
ACMIN
=
×
×
η
; where V
ACMIN
is from step 1 and PF is the power factor
of the power supply which
is typically between 0.5 and 0.7. If no better reference data is available, use 0.5.
Step 35. TOPSwitchflyback power supply design complete.
Rectifier
V
R
(V)
Manufacturer
1N4148
BAV21
UF4003
75
200
200
Motorola
Philips
GI
Table 9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AN-22 | OBSOLETE when inventory is depleted. 10% tolerance no l |
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