MC7809A Fairchild, MC7809A Datasheet - Page 22

• Manufacturer Part Number: MC7809A
• Description: 3-Terminal 1A Positive Voltage Regulator
• Manufacturer: Fairchild

MC78XX/LM78XX/MC78XXA
Notes:
(1) To specify an output voltage. substitute voltage value for "XX." A common ground is required between the input and the
(2) C
(3) C
22
Output voltage. The input voltage must remain typically 2.0V above the output voltage even during the low point on the input
ripple voltage.
I
O
is required if regulator is located an appreciable distance from power Supply filter.
improves stability and transient response.
Input
Input
CI
Figure 11. Adjustable Output Regulator (7 to 30V)
Figure 10. Circuit for Increasing Output Voltage
Input
CI
Figure 9. Constant Current Regulator
CI
MC7805
LM7805
V
V
O
O
MC78XX/LM78XX
MC78XX/LM78XX
= V
= V
XX
XX
I
RI
I
RI
(1+R
(1+R
5IQ
5 I
2
2
LM741
Q
/R
/R
Co
1
1
)+I
)+I
Co
Q
Q
R
R
2
2
Output
Output
Output
Co