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參數(shù)資料
| 型號(hào)： | AN-22 |
| 英文描述： | OBSOLETE when inventory is depleted. 10% tolerance no l |
| 中文描述： | 設(shè)計(jì)多路輸出電源的的TOPSwitch |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 569K |
| 代理商： | AN-22 |
AN-22
C
5/98
12
PIV
5
5
375
4
77
25
=
+
×
V
For the 12 V output,
PIV
12
12
375
9
77
56
=
+
×
V
For the 30 V output,
PIV
30
30
375
22
77
137
=
+
×
V
The diodes chosen for each output should have a reverse
voltage rating 1.25
×
PIV
X
. This insures that the peak reverse
voltage never exceeds 80% of the rating of a particular diode.
Hence, in this case, the diode on the 5 V output should be rated
for more than 30 V, the 12 V output more than 70 V, and the
30 V output more than 171 V. Peak reverse voltages should be
measured on all diodes under maximum load and startup
conditions to ensure that ratings are not exceeded.
The rule of thumb for the diode current rating is to choose a
device with a DC current rating at least three times the average
DC output current of the particular output. From the current
specifications of Table 1 and the voltage requirements above,
the following minimum ratings should be defined in this case:
5 V output diode
—
6.0 A, 30 V
12 V output diode
—
3.6 A, 70 V
30 V output diode
—
60 mA, 171 V
Figure 7. Modified Schematic with Feedback from Both 5 V & 12 V Outputs.
5 V
RTN
BR1
400 V
C1
68
μ
F
400 V
C4
0.1
μ
F
U1
TOP223
R2
100
1/2 W
D8
MBR745
D3
1N4148
C2
1000
μ
F
35 V
T1
D1
BYV26C
C7*
1000 pF
250VAC
Y1
C3
120
μ
F
25 V
U2
CNY 17-2
U3
TL431
R4
21 k
R5
10 k
C9
0.1
μ
F
R1
75
VR1
P6KE200
L1
3.3
μ
H
F1
1.0 A
J1
C6
0.1
μ
F
L2
33 mH
L
N
* Two series connected, 2.2 nF, Y2-capacitors can replace C7.
D4
MUR420
L3
3.3
μ
H
D5
UF4004
C12
100
μ
F
50 V
30 V
C11
100
μ
F
35 V
C6
100
μ
F
50V
12 V
C5
47
μ
F
D
S
C
CONTROL
R3
5.2
TOPSwitch-II
C10
390
μ
F
35 V
PI-2131-121197
R6
75 k
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