LM7818CT 查看數據表（PDF） - Fairchild Semiconductor

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LM7818CT

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Input

CI

1

0.33µF

LM7805

2

3

6

-2

LM741

+3

4

Output

10kΩ

CO

0.1µF

IRI ≥ 5 IQ

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

Figure 13. Adjustable Output Regulator (7V to 30V)

Input

R1

3Ω

R1 = VBEQ1

IREG–IQ1 BQ1

Q1 BD536

IQ1

1

3

LM78XX

IREG

2

0.33µF

Output

IO

0.1µF

IO = IREG + BQ1 (IREG–VBEQ1/R1)

Input

Figure 14. High Current Voltage Regulator

RSC

Q1

Q2

R1

3Ω

Q1 = TIP42

Q2 = TIP42

RSC

=

VBEQ2

I SC

1

0.33µF

LM78XX 3

2

0.1µF

Output

Figure 15. High Output Current with Short Circuit Protection

24

LM78XX/LM78XXA Rev. 1.0

www.fairchildsemi.com

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