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R-9370
SYNCHRONIZING
SIGNAL
CIRCUIT
At
the
secondary
side of
the power source circuit there is
to PA1 terminal of LSI. This voltage
is referred
to as a power
caused
AC
half-wave
rectified
voltage
and
it is applied via R7
sync. signal.
R7
58
>
11.
-
-
c PA1
LS I
J--\
i'"'
I
I
I
20.0
msec.
I
I--
-l
Figure T-4. 13 Circuit and Waveform
ACL CIRCUIT
By
switching
on
power,
charge
current
(il)
is fed
to
C20
through
R20
and generates throshold
voltage
(Vz).
If Vz exceeds the zener voltage of ZD20, ZD20 is turned on
and the current
2 flows.
Thus, placing voltage on to the base
of transistor 020 and turning it on.
A reset signals is obtained from the collector.
C21: Noise filter capacitor.
GND,
a
*
v
w
v
I
1
Q20
--
j/z; + il
r
---1
I
I
=c20
I
-
c21
t
*
2020
;
u
I
I
I
T
voD>
fz-
L---p-
(-12V)
RESET
GND
RESET
J
Figure T-5. ACL C ircuit
16
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