MC7812E Fairchild Semiconductor, MC7812E Datasheet - Page 20

• Manufacturer Part Number: MC7812E
• Description: The MC78XXE/LM78XXE/MC78XXAE series of three terminal positive regulators are available in the TO-220/D-PAK package and with several fixed output voltages, making them useful in a wide range of applications
• Manufacturer: Fairchild Semiconductor

MC78XXE/LM78XXE/MC78XXAE
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
20
Input
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.
Cl
0.33uF
Input
1
Input
MC7805E
LM7805E
2
Cl
Figure 11. Adjustable Output Regulator (7 to 30V)
0.33uF
Figure 10. Circuit for Increasing Output Voltage
0.33uF
I
VO = V
1
RI
Figure 9. Constant Current Regulator
MC78XXE/LM78XXE
3
1
5IQ
I
VO = V
RI
XX
I
MC78XXE/LM78XXE
Q
I
O
(1+R
5IQ
=
XX
6
2
2
V
R
(1+R
/R
XX
1
4
1
2
LM741
)+I
I
2
Q
+ I
/R
Q
R
Q
+
1
_
2
)+I
3
3
0.1uF
2
C
Q
O
R
0.1uF
2
Co
3
R1
10k
VXX
VXX
0.1uF
Co
R2
R1
I
R
O
L
Output
Output
Output