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 H_FE of the external pass transistor.
MJD32C
In
Out
R1
10 mF
.033 mF
R2
4 Ext
3 V_O
MC78BCXXNTR
Figure 10. External PNP
MJD32C
10 k
.033 mF
4
Ext
In
V_DD
2
V_O
3
10 mF
MC78BC50NTR
Gnd
CE
1
5
Figure 11. Typical Application
Out
5.0 V
10 mF
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