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REV.-A
When PC 1 is activated, the voltage at shunt regulator gap G reaches at least 2.5V, K-A become a
conductor, 03 goes on, 02 goes on, and shunt transistor 01 goes off.
Even if PC 1 is not activated, K-A will conduct if current I in the transformer's primary winding surpasses
a certain value, creating a potential difference of at least 2.5V across resistance R4. Resistance R4,
in other words, serves as an excess current detector.
03
R4
R 13
0.68
1.8k
(1.3 2W) 2W
RIO
2k
ICI
LS431
120 V Version
( ): 220/240 V Version
Figure 2-12. Switching Circuit (When PC 1 Operation)
7
60
VIN
(S/84Vlo)
R4
0.68
(1.3 2W) 2W
R10
2k
IC 1
LS431
120 V Version
( ): 220/240 V Version
Figure 2-13. Over-Current Protection (OCP)
2-17
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