LM7909CT View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

MFG CO.

LM7909CT

3-Terminal 1A Negative Voltage Regulator

Fairchild Semiconductor 

Typical Applications

MC79XX/MC79XXA/LM79XX

+ 2.2µF

+ 1µF

CI

1

CO

- VI

Input

2 MKCA7799XXXX 3

LM79XX

- VO

Output

Figure 6. Negative Fixed output regulator

+ 15V

1 MKCA77881122 3

+

+

C1

0.33µF

2

Co

1µF

- 15V

+ 2.2µF

C1

1µF +

1 Co

2 MKCA7991122 3

+12V

1N4001

*

GND

1N4001

*

-12V

Figure 7. Split power supply ( ± 12V/1A)

Notes:

(1) To specify an output voltage, substitute voltage value for "XX "

(2) Required for stability. For value given, capacitor must be solid tantalum. If aluminium electronics are used, at least ten times

value shown should be selected. CI is required if regulator is located an appreciable distance from power supply filter.

(3) To improve transient response. If large capacitors are used, a high current diode from input to output (1N400l or similar)

should be introduced to protect the device from momentary input short circuit.

15

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