MC7812E(2012) Просмотр технического описания (PDF) - Fairchild Semiconductor

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производитель

MC7812E
(Rev.:2012)

3-Terminal 1A Positive Voltage Regulator

Fairchild Semiconductor 

MC78XXE

Input

1

0.33uF

MC78XXE

2

IQ

3

0.1uF R1 VXX

CO

Output

IO

IO =

VXX

R1

+ IQ

RL

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.

1

Input

Cl

0.33uF

MC78XXE

2

IQ

3

0.1uF

Co

Output

VXX

R1

IRI 5IQ

R2

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

Figure 10. Circuit for Increasing Output Voltage

Input

1

MC7805E

3

2

Cl

0.33uF

6

_2

LM741 3

4

+

Output

10k

0.1uF

Co

IRI 5IQ

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

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

6

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