ua78s40 ETC-unknow, ua78s40 Datasheet - Page 5

• Manufacturer Part Number: ua78s40
• Description: Switching Regulator Subsystem
• Manufacturer: ETC-unknow

MOTOROLA ANALOG IC DEVICE DATA
25V
12V
V in
V in
100
100
+
+
R1
R1
1.2k
22k
3.6k
47k
R2
R2
8
8
9
9
Reference
Reference
1.25V
1.25V
10
10
7
7
C T
C T
Figure 5. Step–Down Converter
Oscilator
Oscilator
–
+
–
+
Figure 6. Step–Up Converter
Comp.
Comp.
11
11
6
6
* Use external rectifier to increase circuit efficiency
I pk
I pk
* Use external rectifier to increase circuit efficiency
C T
–
+
C T
–
+
Amp
Amp
Op
Op
12
12
A78S40
5
5
1500
470
pF
pF
V CC
V CC
13
13
4
4
R SC
R SC
0.33
0.22
S
R
S
R
14
14
3
3
Q
Q
180
15
15
2
2
170
170
170 H
L
D1
D1
*
*
16
16
1
1
1N5822
1N5822
220 H
L
470
150
+
C O
V out
5.0V/500mA
+
C O
V out
28V/175mA
5