MC1723C Datasheet, PDF (5/8 Pages) ON Semiconductor – VOLTAGE REGULATOR

MC1723C
Figure 16. Typical Connection for 2 < VO < 7
12
+Vin
11
R1
6
5
Cref ^R2
10
2
3
MC1723C
4
13
7
RSC
Vout
R3
1000pF
^ VO
7
R2
R1 + R2
^ ISC =
Vsense
RSC
0.66
RSC
at TJ = + 25°C
For best results 10 k < R1 +R2 < 100 k
For minimum drift R3 = R1 R2
+ Vin
Vout
ISC
IL
Figure 17. Foldback Connection
12
10
RSC
11
2
RA
6
10k
MC1723C
4
5
13 100pF
Vout
R1
R2
3
7
Iknee
RA =
a
1–a
10 kΩ where
RSC
=
Vsense
(1–a) ISC
a = ^Vsense
VO
Iknee
ISC
–1
Figure 18. +5.0 V, 1.0 A Switching Regulator
Figure 19. +5.0 V, 1.0 A High Efficiency Regulator
2N4918 or Equiv
11
100
12
Vin
+10V
6
2.2k
1.0M
1.0k
5
0.1µF
5.1k
MC1723C
7
1mH
1N4001
or Equiv
Vin1
+6.5V
Vin2
+10V
Vout
0.1µF
12
10
10
+5V
11
2
3
+
4
100µF
–
6
2.0k
5
5.1k
MC1723C
7
Vout
0.33 +5.0V
10
2
3
4
13
1000pF
Figure 20. +15 V, 1.0 A Regulator with Remote Sense
Vin
+20V
0.1µF
2N3055 or Equiv
12
10
11
2
3
MC1723C
6
4
5
100pF
13
7
0.33
12k
10k
+ Sense Vout
+15V
Load
– Sense
Figure 21. –15 V Negative Regulator
12
11
6
5
+
Vref
Vin = –20 V
MC1723C
7
–
10
4
100pF
13
V2 = 14V
12k
+
+
Vref
10µF
–
10k
–
Vout = –15 V
2N3055
or Equiv
MOTOROLA ANALOG IC DEVICE DATA
5