KA7808 查看數據表（PDF） - Fairchild Semiconductor

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KA7808

3-Terminal 1A Positive Voltage Regulator

Fairchild Semiconductor 

KA78XX/KA78XXA

Input

CI

Output

CO

Figure 9. Constant Current Regulator

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.

Input

CI

Output

CO

IRI ≥ 5IQ

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

Figure 10. Circuit for Increasing Output Voltage

Input

CI

Output

CO

IRI ≥5 IQ

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

Figure 11. Adjustable Output Regulator (7 to 30V)

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