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零件编号
产品描述 (功能)
UA78S40(2006) 查看數據表(PDF) - ON Semiconductor
零件编号
产品描述 (功能)
生产厂家
UA78S40
(Rev.:2006)
Universal Switching Regulator Subsystem
ON Semiconductor
UA78S40 Datasheet PDF : 7 Pages
1
2
3
4
5
6
7
V
in
25V
+
100
UA78S40
R
SC
0.33
C
T
470
pF
9
10
11
12
13
14
15
16
V
CC
C
T
I
pk
Oscillator
SQ
1.25V
Reference
−
Comp.
+
−
Op
+Amp
R
170
D1
8
R2
3.6k
R1 1.2k
7
6
5
4
3
2
*Use external rectifier to increase circuit efficiency
Figure 6. Step
−
Down Converter
1
1N5822
*
L
V
out
220
m
H
5.0V/500mA
+
470 C
O
V
in
12V
+
100
L
R
SC
0.22
C
T
1500
pF
170
m
H
180
9
10
11
12
13
14
15
16
V
CC
C
T
I
pk
Oscillator
SQ
1.25V
Reference
−
Comp.
+
−
Op
+Amp
R
170
D1
8
R2
47k
R1 22k
7
6
5
4
3
2
*Use external rectifier to increase circuit efficiency
Figure 7. Step
−
Up Converter
1
1N5822
*
150
V
out
28V/175mA
+
C
O
http://onsemi.com
5
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