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