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LM7805CT Datasheet(PDF) 23 Page - Fairchild Semiconductor

Part No. LM7805CT
Description  3-Terminal 1A Positive Voltage Regulator
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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 23 page
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www.fairchildsemi.com
LM78XX/LM78XXA Rev. 1.0
Figure 10. Fixed Output Regulator
Figure 11.
Figure 12. Circuit for Increasing Output Voltage
0.1
µF
CO
CI
0.33
µF
Output
Input
LM78XX
1
3
2
0.1
µF
CO
CI
0.33
µF
Output
Input
LM78XX
1
3
2
VXX
R1
RL
IQ
IO
IO =
R1
+ I
Q
VXX
Notes:
1. 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 typically 2.0V above the output voltage even during the low point on the input
ripple voltage.
2. CI is required if regulator is located an appreciable distance from power supply filter.
3. CO improves stability and transient response.
0.1
µF
CO
CI
0.33
µF
Output
Input
LM78XX
1
3
2
VXX
R1
R2
IQ
IRI ≥ 5 IQ
VO = VXX(1+R2/R1)+IQR2




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