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Número de pieza
componentes Descripción
UA78S40PC Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
componentes Descripción
Fabricante
UA78S40PC
Universal Switching Regulator Subsystem
Motorola => Freescale
UA78S40PC Datasheet PDF : 8 Pages
1
2
3
4
5
6
7
8
Vin
25V
+
100
µ
A78S40
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
220
µ
H
470
Vout
5.0V/500mA
+
CO
Vin
12V
+
100
Figure 6. Step–Up Converter
L
RSC
0.22
CT
1500
pF
170
µ
H
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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