KA7818ETU 查看數據表（PDF） - Fairchild Semiconductor

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KA7818ETU

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Typical Applications (Continued)

Input

CI

1

0.33μF

3

KA78XXE

2

CO

Output

0.1μF

Figure 9. Fixed Output Regulator

Input

1

3

KA78XXE

CI

0.33 μF

2

CO

IQ

0.1 μF

Vxx

R1

Output

IO

RL

Vxx

IO = R1 + IQ

Figure 10. Constant Current Regulator

Notes:

33. 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.

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

35. CO improves stability and transient response.

Input

1

3

KA78XXE

CI

0.33 μF

2

CO

IQ

0.1 μF

Output

Vxx R1

R2

IRI ≥ 5IQ

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

Figure 11. Circuit for Increasing Output Voltage

© 2006 Fairchild Semiconductor Corporation

KA78XXE / KA78XXAE Rev. 1.9

21

www.fairchildsemi.com

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