KAC-X810D/PS810D
5
CIRCUIT DESCRIPTION
1. PWM Signal Waveform Generation
A
and
B
are sent to the comparator so as to generate the
PWM waveform of
C
. (A clock of 50% in duty ratio is
obtained when
B
is 0.)
A
: Chopping wave
B
: Analog input
C
: PWM Signal
A
B
C
0
0
UP
DOWN
UP
DOWN
UP
Dead Time
The waveform of
C
is divided into upper and lower gate
waveforms. An OFF section is created so that the upper
gate waveform is not turned on simultaneously with the
lower gate waveform.
MUTE
Q6
D12
D10
D13
D9
D43
D8
IC9
AMP
IC8
(2/2)
SUMMING
D39
(2/2)
IC11
D17
GEN CIRCUIT
DEAD TIME
(2/4)
(2/4)
(1/4)
IC10
IC10
IC10
(4/4)
IC10
(3/4)
D16
PWM WAVE
GEN CIRCUIT
(1/2)
IC9
IC8
(1/2)
IC11
D19
(1/4)
D18
VI CONV
4
1800P
R58
33K
10.3V
8
3
2
150
+10.3V
R77
820
R86
4.7K
R270
C57 47P
R100 680K
47u 10V
68K
C58
3900P
+
C49
R101
+
R71 3.3K
82K
R75
C47 0.1
C42
1u50
R78
1K
6
R83
1K
5
24K
R107
5
4
R108
1.5K
R105
4.7K
7
3
6
12
C55
39P
12
13
C36 47u10
+
10K
R85
2
510
R66
7
1
14
6
5
4
3
11
C54
13
12
11
39P
R84 10K
10
9
8
C62
0.01
IC9(2/2)
R106
10K
10.3V
1
C59
0.01
9
11
10
8
7
R70
10K
R69
C56
3K
+10.3V
R73
1.5K
7
R119
1K
14
10
9
8
R118
1K
+5V
+5V
+5V
10.3V
C
B
Analog-fed back from
the output stage.
Audio
signal
Chopping wave generator circuit
The dead time is determined by
this time constant.
Upper gate
Lower gate
A
