KIA6924S 데이터 시트보기 (PDF) - KEC
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KIA6924S Datasheet PDF : 10 Pages
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KIA6924S
CHARGE AND DISCHARGE LEVEL DETECTION
A built-in trigger amplifier is included in
KIA6924S for responding either to positive
or negative pulse.In the trigger amplifier, two
amplifiers are mounted in parallel; one is
responding at a small level,while the other is
responding at a large level. Both amplifiers
are coupled to the discharge level detector
circuit as shown Fig. 1 respectively.
6
CT
Q2
RT
2
Q5
Q6
R1
Q9
Q8
Q7
Q1
Q4
Q2
RB
VCC
Q12
Q13
9
=3VBE
=VBE
Q10
8
Q11
7
5
4
SW
AC100V
Fig.1 Charge and Discharge Level Equivalent Circuit
The discharge level detector circuit forms a flip-flop discharge circuit.
The circuit is designed so that the trigger pulse width to discharge circuit may be maintained beyond constant width to discharge
fully the charge of CT (Capacitor for muting and charging operation) even when the smaller width pulse is given to the trigger amplifier.
Charge operation and muting operation are described as follows.
1. OPERATION AT POWER (VCC) ON (Refer to FIG.2)
As soon as the power supply (VCC) is ON, CT starts to be charged through RT and the potential V6 on pin rises gradually, in this case,
Q8 remains conductive till the base potential of Q7 becomes equal to or more than the base potential ( 3VBE 2.1V ) of Q8 and the muting
operation is carried on by putting the muting output TR Q10 and Q11 to ON position.
When the base potential of Q7 rises higher than that of Q8, the Q8, Q10 and Q11 are OFF to release the muting operation. CT charge stops
at such a level as the base potential of Q7 is VBE( 0.7V)
Point at which both bases of Q7 and Q6 become
one and the same voltages
higher than that of Q8.
Charging curve of C
T
3.5
V2 =~ 5VBE
30
20
10
0
0
VTH
MT
Q7 Base
Q9
potential
VBE Q6 Base
potential
=~ 3VBE
Muting operating
time at power ON
1
2
3
4
Power supply ( VCC ) ON
5
t(sec)
Q1 : For discharge stop
Q2 : For Q1 drive
Q3 and Q3' : For discharge
Q4 : For muting operation at power OFF
Q5 and Q6 : Discharge level detecting differential
Q7 and Q8 : For charge level detection and
muting output stage drive
Q9 : For charge level limit
Q10 and Q11 : Output TR for muting
Fig.2 Operating Potential of
Each Part at Power ON
1994. 11. 11
Revision No : 0
5/10
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