LM78XX / LM78XXA —
3-T
e
rminal
1 A Positive V
o
lt
age Regulator
© 2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM78XX / LM78XXA Rev. 1.3.1
20
Typical Applications
(Continued)
Figure 12. Adjustable Output Regulator (7 V to 30 V)
Figure 13. High-Current Voltage Regulator
Figure 14. High Output Current with Short-Circuit Protection
LM741
-
+
2
3
6
4
2
3
1
0.33
μ
F
C
I
Input
Output
0.1
μ
F
C
O
LM7805
10k
Ω
I
RI
≥
5 I
Q
V
O
= V
XX
(1
+
R
2
/
R
1
)
+
I
Q
R
2
3
2
1
LM78XX
Output
Input
R1
3
Ω
0.33μF
IREG
0.1μF
I
O
IQ1
I
O
= I
REG
+ B
Q1
(I
REG
–V
BEQ1
/R
1
)
Q1 BD536
R1 =
V
BEQ1
I
REG
–I
Q1
B
Q1
/
LM78XX
Output
0.1μF
0.33μF
R1
3
Ω
3
2
1
Q1
Input
Q2
Q1 = TIP42
Q2 = TIP42
R
SC
=
I
SC
V
BEQ2
R
SC