LM7818CT(2013) 查看數據表（PDF） - Fairchild Semiconductor

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LM7818CT
(Rev.:2013)

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Input

CI

1

0.33μF

LM78XX

2

3

Output

CO

0.1μF

Figure 9. Fixed-Output Regulator

Input

CI

1

0.33μF

LM78XX

2

IQ

3

Output

CO

0.1μF

V XX

R1

IO

RL

IO

=

VXX

R1

+ IQ

Notes:

29. 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 2.0 V above the output voltage even during the low point on

the input ripple voltage.

30. CI is required if regulator is located an appreciable distance from power supply filter.

31. CO improves stability and transient response.

Figure 10.

Input

1

3

LM78XX

CI

0.33μF

2

CO

IQ

0.1μF

Output

VXX R1

R2

IRI ≥ 5 IQ

VO = VXX(1 + R2 / R1) + IQR2

Figure 11. Circuit for Increasing Output Voltage

© 2006 Fairchild Semiconductor Corporation

LM78XX / LM78XXA Rev. 1.3.0

19

www.fairchildsemi.com

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