to
d r i v e r a m p l i f i e r
I
a
C 8 0
+ o u t
S e r i e s
r e g u l a t o r
F i g u r e
2 9
The series regulator consists of a number of parallel connected power
transistors T7L Each one has an emitter resistor R70.
The number of power transistors is :
RAC PAC
150
2
pcs
RAC PAC
300
3
pcs
RAC PAC 600
5
pcs
RAC PAC
1000
RACPAC 1000
B 32-30R
8
pcs
B 32- 15R
7
pcs
In order to compensate for the differences
in
the characteristics of the
T71's, the resistors R70 are inserted. Without these current sharing resis
tors risk exists for overloading one of the transistors , as its collector
current might become too high. The R 7 1 ' s take the average of the voltage
across the R70 ' s . This voltage is proportional to the output current and is
used for current limit, firing, output ammeter etc .
3 3
