KA7805ER(2003) View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

View to exact match

KA7805ER
(Rev.:2003)

3-Terminal 1A Positive Voltage Regulator

Fairchild Semiconductor 

KA78XXE/KA78XXAE

Input

1

3

KA78XXE

Output

CI

0.33µF

2

CO 0.1µF

Vxx

R1

IQ

IO

RL

Vxx

IO = R1 + IQ

Notes:

Figure 9. Constant Current Regulator

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

1

0.33µF

3

KA78XXE

2

CO

IQ

0.1µF

Output

Vxx R1

R2

IRI ≥ 5IQ

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

Figure 10. Circuit for Increasing Output Voltage

Input

1

KA7805E

3

2

CI

0.33µF

6

-2

KA741

+3

4

Output

10KΩ

CO

0.1µF

IRI ≥5 IQ

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

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

20

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