參數(shù)資料
型號： AN-32
英文描述： TOPSwitch-GX Flyback Design Methodology
中文描述： 的TOPSwitch - GX系列反激式設(shè)計方法
文件頁數(shù)： 13/16頁
文件大小： 134K
代理商： AN-32
AN-32
13
B
12/02
Step 30. Select output rectifier per Table 9
V
≥
1.25
x
PIV
; where PIV
is from Step 28 and V
R
is the
rated reverse voltage of the rectifier diode.
I
D
≥
3
x
I
O
; where I
D
is the diode rated DC current and
I
O
= P
O
/ V
O
.
Rec. Diode
Schottky
1N5819
SB140
SB160
MBR160
11DQ06
1N5822
SB340
MBR340
SB360
MBR360
SB540
SB560
MBR745
V
R
(V)
I
D
(A)
Package Manufacturer
40
40
60
60
60
40
40
40
60
60
40
60
45
1
1
1
1
Axial
Axial
Axial
Axial
Axial
Axial
Axial
Axial
Axial
Axial
Axial
Axial
TO-220 General Semi
IR
TO-220 General Semi
TO-220 General Semi
IR
TO-220 General Semi
TO-220 General Semi
TO-220 General Semi
IR
TO-220 General Semi
20(2
x
10) TO-220 General Semi
General Semi
General Semi
General Semi
IR
IR
General Semi
General Semi
IR
General Semi
IR
General Semi
General Semi
1.1
3
3
3
3
3
5
5
7.5
MBR760
MBR1045
60
45
7.5
10
MBR1060
MBR10100
MBR1645
60
100
45
10
10
16
MBR1660
MBR2045CT
60
45
16
IR
MBR2060CT
MBR20100
60
100 20(2x10) TO-220 General Semi
20(2x10) TO-220 General Semi
IR
UFR
UF4002
UF4003
MUR120
EGP20D
BYV27-200
100
200
200
200
200
1
1
1
2
2
Axial
Axial
Axial
Axial
Axial
General Semi
General Semi
General Semi
General Semi
General Semi
Philips
General Semi
General Semi
General Semi
General Semi
Philips
UF5401
UF5402
EGP30D
BYV28-200
100
200
200
200
3
3
3
Axial
Axial
Axial
Axial
3.5
MUR420
BYW29-200
200
200
4
8
TO-220 General Semi
TO-220 General Semi
Philips
TO-220 General Semi
Philips
BYV32-200
200
18
Table 9.
Step 31. Select output capacitor
Ripple current specification at 105
°
C, 100 kHz: Must be
equal to or larger than I
where I
is from Step 27.
ESR specification: Use low ESR, electrolytic capacitor.
Output switching ripple voltage is I
SP
x
ESR , where I
SP
is
from Step 24.
Examples:
Output
Output Capacitor
5 V to 24 V, 1 A 330
μ
F, 35 V, low ESR, electrolytic
UnitedChemicon
LXZ35VB331M10X16LL
Rubycon 35YXG330M10
x
16
Panasonic EEUFC1V331
5 V to 24 V, 2 A 1000
μ
F, 35 V, low ESR, electrolytic
United Chemicon
LXZ35VB102M12X25LL
Rubycon 35YXG1000M12.5
x
25
Panasonic EEUFC1V102
Step 32.
Select output post filter L, C
Inductor L: 2.2
μ
H 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:100
μ
F to 330
μ
F, 35 V, electrolytic
Examples for 100
μ
F, 35 V, electrolytic:
United Chemicon KMG35VB101M6X11LL
Rubycon 35YXA100M6.3
x
11
Panasonic ECA1VHG101
Step 33. Select bias rectifier from Table 10
V
≥
1.25
x
PIV
; where PIV
is from Step 28 and V
R
is the
rated reverse voltage of the rectifier diode.
Rectifier
BAV21
UF4003
1N4148
V
R
(V)
200
200
75
Manufacturer
Philips
General Semi
Motorola
Step 34. Select bias capacitor
Use 0.1
μ
F, 50 V, ceramic.
Step 35. Select CONTROL pin capacitor and series resistor
CONTROL pin capacitor: 47
μ
F, 10 V, low cost electrolytic
(Do not use low ESR capacitor).
Table 10.
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