MC78BC00 Datasheet, PDF (6/8 Pages) Motorola, Inc – VOLTAGE REGULATOR WITH EXTERNAL POWER TRANSISTOR

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