19 www.fairchildsemi.com
LM7805 • LM7806 • LM7808 • LM7809 • LM7810 • LM7812 • LM7815 • LM7818 • LM7824 • LM7805A • LM7806A • LM7808A
•LM7809A • LM7810A • LM7812A • LM7815A • LM7818A • LM7824A
Typical Applications (continued)
FIGURE 9.
Note: To specify an output voltage, substitute voltage value for “XX”. A common ground is required between the Input and the Output voltage. The input voltage must remain typ-
ically 2.0V above the output voltage even during the low point on the input ripple voltage.
Note: C
I
is required if regulator is located an appreciable distance from the power supply filter.
Note: C
O
improves stability and transient response.
I
RI
5 I
Q
V
O
= V
XX
(1 R
2
/ R
1
) I
Q
R
2
FIGURE 10. Circuit for Increasing Output Voltage
I
RI
5 I
Q
V
O
= V
XX
(1 R
2
/ R
1
) I
Q
R
2
FIGURE 11. Adjustable Output Regulator (7V to 30V)
