MC78BC00 Series

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6

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,

Figure 10. External PNP

Out

MJD32C

Ext

10

mF

3

4

In

R1

R2

MC78BCXXNTR

.033

mF

Figure 11. Typical Application

Out

5.0 V

MJD32C

Ext

1

2

In

3

4

5

CE

Gnd

10

mF

10

mF

MC78BC50NTR

10 k

.033

mF