October 2013
Intermediate to advanced
312 pages
12h 10m
English
Content preview from The Maplin Electronic Circuits Handbook, 2nd Edition
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66 POWER SUPPLIES
Figure
3.29 Current boosted
negative-output IC voltage
regulator
-13 V
0 V-
TRj
TIP3055
10
In
c
i :
100 η
ic
2
7905
Com.
Out
100 η
V = -5 V
•out
J v
(5 A maximum)
τ o
10μ
-Ο 0 V
The power transistors specified in Figures 3.28 and 3.29 are plastic TAB
versions of the ever-popular metal cased T03 encapsulated PNP3055 and
2N3055.
The TIP2955 and TIP3055 are, however, easier to mount and
share the same 15 A maximum collector current rating as their metal
cased counterparts.
The regulator operates normally (i.e. the transistor remains idle) for
current of less than approximately 60 mA but, beyond this figure, the
transistor begin
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