KIA6924S 데이터 시트보기 (PDF) - KEC
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KIA6924S Datasheet PDF : 10 Pages
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KIA6924S
3. MUTING AT POWER ON/OFF
(Refer to Fig. 6)
3-1. MUTING AT POWER ON
Muting at power ON continues till V2-5 is over about. 2.8V(4VBE),
V2-5
Q12 and Q13 are turned ON, the timing capacitor CT is charged,
3.5V
2.8V
and the base potential of Q7 rises to about 2.1V (5VBE).
(4VBE )
Therefore, early rise is recommended for V2-5 potential.
3-2. MUTING AT POWER OFF
Muting at power starts operating by decreasing the detecting
terminal (pin ) at OFF to about 0.7V or less (making Q4 OFF.)
Therefore, such a signal as is more than 0.7V in normal
operation but turned to less than 0.7V instantly at power
OFF, is required to be made.
V6
2.8V
(4VBE )
2.1V
(3VBE)
Muting at power OFF starts operating at the time when
potential becomes less than 0.7V and continues till V2-5 becomes
2.8V or less. Therefore, the slow falling of V2-5 is more effective.
The detecting terminal at power OFF (pin ) is available for
trigger input; however, it is recommended that this terminal be
linearly triggered as much as possible, because a narrower width
pulse may miss ample discharge from the timing capacitor.
4. MUTING TIME
Muting time at power ON and caused by trigger is decided by the
timing CT and RT. With the consideration for Q5 and Q7 base
currents, the following are roughly given:
Muting at
power ON
V4
Muting at
power OFF
CT
Charge
curve
0.7V
(VBE )
t
t
Fig.6 Muting Operation Power ON - OFF
V2-5
(3.5V)
Pin 1
(Trigger A)
Muting time at power ON : MT(ON)=1.3RTCT
Fig. 7 Lengthening Way of
Muting Time
Muting time at trigger : MT(TR) 0.45RTCT
Here, if muting time is lengthened by setting RTCT time constant larger, distorted waves asymmetrical with respect to top and
bottom may be originated by the slow speed of wave rise at muting OFF.
Experiment tells that MT(ON)=1.4sec (RT=220k and CT=4.7 F) or less has brought a good result.
When MT (ON) is required especially to be made longer, a method of applying the trigger
terminal as shown in Fig.7 and another method of giving a signal of slow rise to the
Output
Rg
detecting terminal at power OFF
(pin ) are considered. To activate a continuous muting, the DC voltage to make muting
ON should be applied to trigger A or B, or the voltage of the detecting terminal at power
OFF (pin ) should be decreased to make Q4 OFF.
7
(a)
Q10(Q11) VIN
8
1994. 11. 11
Revision No : 0
Fig. 8 Muting Output
8/10
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