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S
KAC-8070
CIRCUIT DESCRIPTION
Clock waveform comparison
KAC-7020:
T is fixed regardless of the loaded condition
of output
voltage, etc.
KAC-8070:
T (pulse width) is widened by 47% at maximum when the
output voltage is increased or load is varied.
Dead time control circuit
RG, 7:
Clock waveform is provided during the quiescent time to
prevent cross
current
from
occuring
at Q5, 6 when
overloaded.
C4:
For reducing the rush current when starting up.
Characteristic test circuit and operational
waveforms
Test circuit
Test (signal
input
O Output 2
* Film capacitor is used
Note:
When emitter follower is output, the
connecting method is changed. Connect C;
and C2 to Vcc and connect E: and E2 to GND
(ground) via RL respectively.
Output control pin connections (13-pin)
13-pin
connection status
Uperatien mode
|
|
Refout
|
Push-pull
|
GND
|
Single (C1, C2 in-phase)
—_
[a=
|
|
=
Vref
[777
C410u
R6680
R7 4.7K
Operational waveforms
plone |
el
Sea
eee .
seen
Cr voltage waveform
(saw-tooth wave
oscillator output)
Threshold _
voltage
i
Dead-Time Contro!
l
input voltage
!
'Max.
Threshold
1
Ty
voltage -=
C, output voltage
waveform
C2 output voltage
waveform
bae—m4
0%
|
Feedback input
07V
t
arr
(error amplifier output)
io
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