Typical Applications (Continued)
Output
Input
1
3
KA7805E
2
CO
0.1μF
-
CI
2
3
0.33μF
6
KA741
10KΩ
+
4
IRI ≥ 5 IQ
VO = VXX(1+R2/R1) + IQR2
Figure 12. Adjustable Output Regulator (7 V to 30 V)
Input
VI
IQ1
Output
Vo
R1
1
3
KA78XXE
3 Ω
Io
IREG
0.33 μF
2
0.1 μF
IO = IREG + BQ1 (IREG-VBEQ1/R1)
Figure 13. High-Current Voltage Regulator
Q1
Input
VI
Q2
Vo
R1
1
3
KA78XXE
Output
3 Ω
2
0.1 μF
0.33 μF
Q1 = TIP42
Q2 = TIP42
VBEQ2
RSC =
ISC
Figure 14. High Output Current with Short-Circuit Protection
© 2006 Fairchild Semiconductor Corporation
KA78XXE / KA78XXAE Rev. 1.9
www.fairchildsemi.com
22
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