LM7818A 查看數據表（PDF） - Fairchild Semiconductor

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LM7818A

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Input

CI

1

0.33µF

LM78XX

2

3

Output

CO

0.1µF

Figure 10. 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:

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.

Figure 11.

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 12. Circuit for Increasing Output Voltage

23

LM78XX/LM78XXA Rev. 1.0

www.fairchildsemi.com

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