KA7818E(2003) 查看數據表（PDF） - Fairchild Semiconductor

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KA7818E
(Rev.:2003)

3-Terminal 1A Positive Voltage Regulator

Fairchild Semiconductor 

KA78XXE/KA78XXAE

Input

VI

IQ1

R1

1

3

KA78XXE

3Ω

IREG

2

0.33uF

Output

Io

Vo

0.1uF

IO=IREG + BQ1 (IREG-VBEQ1/R1)

Figure 12. High Current Voltage Regulator

Input

Q1

VI

Q2

R1

3Ω

Q1 = TIP42

Q2 = TIP42

1

0.33uF

KA78XXE 3

2

0.1uF

RSC = VBEQ2

ISC

Figure 13. High Output Current with Short Circuit Protection

Vo

Output

1

KA78XXE 3

VI

VO

2

0.33uF

0.1uF

4.7KΩ

COMMON

7 _2

6 KA741

4 +3

4.7KΩ

COMMON

-VIN

TIP42

-VO

Figure 14. Tracking Voltage Regulator

21

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