MC78BC33NTR 查看數據表（PDF） - Motorola => Freescale

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MC78BC33NTR

Micropower Voltage Regulator

Motorola => Freescale 

MC78BC00 Series

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

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.

Figure 10. External PNP

MJD32C

In

Out

R1

10 µF

.033 µF

R2

4 Ext

3 VO

MC78BCXXNTR

Figure 11. Typical Application

MJD32C

10 k

.033 µF

4

Ext

In

VDD

2

VO

3

10 µF

MC78BC50NTR

Gnd

CE

1

5

Out

5.0 V

10 µF

6

MOTOROLA ANALOG IC DEVICE DATA

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