MC780XXE Datasheet, PDF (21/26 Pages) Fairchild Semiconductor – 3-Terminal 1A Positive Voltage Regulator

MC78XXE/LM78XXE/MC78XXAE
Input
Q1 BD536
IQ1
R1
1
3
MC78XXE/LM78XXE
3Ω
IREG
2
0.33uF
IO = IREG+BQ1(IREG - VBEO1/R1)
Figure 12. High Current Voltage Regulator
Input
RSC
Q1
IO
0.1uF
Output
VBEQ1
R1 = _{IREG - IQ1 BQ1}
Q2
R1
3Ω
Q1 = TIP42
Q2 = TIP42
VBEQ2
RSC= _ISC
3
MC78XXE/LM78XXE
0.33uF
2
0.1uF
Figure 13. High Output Current with Short Circuit Protection
Output
1
3
VI
MC78XXE/LM78XXE
VO
2
0.33uF
0.1uF
4.7KΩ
COMMON
7
_2
6
LM741
4
+
3
4.7KΩ
COMMON
-VIN
TIP42
-VO
Figure 14. Tracking Voltage Regulator
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