MC78BC33NTR(2006) 查看數據表（PDF） - ON Semiconductor

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MC78BC33NTR
(Rev.:2006)

Micropower Voltage Regulator

ON Semiconductor 

MC78BC00 Series

External PNP Transistor

In

2

Vin

4 Ext

VO

Out

3

RA

Error

Amplifier

RB

10 mF

Vref

GND

1

CE 5

Figure 9. Typical Operation

External PNP Transistor

The external pin of this IC is protected by a current limit

circuit from the destruction caused by excess current. The R2

resistor shown in Figure 10 is used for the protection of the

MJD32C

In

R1

Out

10 mF

.033 mF

R2

4 Ext

3 VO

external transistor, although this circuit can operate without

the resistor. Resistor R2 should be determined via the input

voltage, output voltage, output current, temperature and the

HFE of the external pass transistor.

MJD32C

10 k

.033 mF

MC78BCXXNTR

Figure 10. External PNP

In

VDD

2

10 mF

4

Ext

MC78BC50NTR

VO

3

Out

5.0 V

10 mF

GND

CE

1

5

Figure 11. Typical Application

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5

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