UA78S40 データシートの表示（PDF） - Motorola => Freescale
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UA78S40 Datasheet PDF : 8 Pages
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Vin
25V
+
100
µA78S40
Figure 5. Step–Down Converter
RSC
0.33
CT
470
pF
9
10
11
12
13
14
15
16
VCC
CT
Ipk
Oscilator
SQ
1.25V
Reference
–
Comp.
+
– Op
Amp
+
R
170
D1
8
R2
3.6k
R1 1.2k
7
6
5
4
3
2
1
*
* Use external rectifier to increase circuit efficiency
1N5822
L
220µH
470
Vout
5.0V/500mA
+
CO
Vin
12V
+
100
Figure 6. Step–Up Converter
L
RSC
0.22
CT
1500
pF
170µH
180
9
10
11
12
13
14
15
16
VCC
CT
Ipk
Oscilator
SQ
1.25V
Reference
–
Comp.
+
– Op
+Amp
R
170
D1
8
R2
47k
R1 22k
7
6
5
4
3
2
1
1N5822
*
* Use external rectifier to increase circuit efficiency
Vout
28V/175mA
+
150 CO
MOTOROLA ANALOG IC DEVICE DATA
5
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