Data Sheet

KA78XXE / KA78XXAE — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
KA78XXE / KA78XXAE Rev. 1.9 22
Typical Applications (Continued)
I
RI
≥ 5 I
Q
V
O
= V
XX
(1+R
2
/R
1
) + I
Q
R
2
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
KA741
-
+
2
3
6
4
2
3
1
0.33μF
C
I
Input
Output
0.1μF
C
O
KA7805E
10KΩ
3
2
1
KA78XXE
Output
Input
R1
3 Ω
0.33 μF
IREG
0.1 μF
Io
Vo
IQ1
V
I
I
O
= I
REG
+ B
Q1
(I
REG
-V
BEQ1
/R
1
)
KA78XXE
Output
Vo
0.1 μF
0.33 μF
R1
3 Ω
3
2
1
Q1
Input
V
I
Q2
Q1 = TIP42
Q2 = TIP42
RSC =
I
SC
V
BEQ2