KAC-PS650D/X650D
3
CIRCUIT DESCRIPTION
7
1K
1K
3
6
14
68P
R369
4.7K
C359
C358
6
1
2
68P
5
4
3
5
4
2
1
R368
8
7
14
9
10
11
R360
12
13
5V
4.7K
4.7K
R370
R371
UP-GATE
DOWN-GATE
C331
R351
R354
47P
C354
2.2K
47u25
C353
100K
R357
6800P
C371
R376
62K
R375
33K
1K
R355
0.1
+
10u16
1K
1K
R356
+
6
5
1.5K
R359
7
4.7K
R358
1800P
3K
4.7K
3
4
10K
R363
R366
8
2
820
R365
1
0.01
10K
R367
C357
1.5K
R364
OUTPUT
MUTE
680K
C352
R353
9
10
7
4
5
6
11
12
C356
R362
3
4
3
4
3
4
5
5
0
0
DEAD TIME
UP
DOWN
UP
5
D313
(2/4)
IC13
D312
IC13
(1/4)
IC12
(3/4)
D311
IC12
(1/4)
(2/4)
IC12
D310
(4/4)
IC12
IC10 (2/2)
Q13
D5
IC10
D305
D309
D306
(1/2)
(1/2)
IC11
: Triangular wave form
: Analogue signal
: PWM wave form
After PWM wave form is divided into up-gate
and down-gate wave forms, this circuit makes
off-timing so that up-gate and down-gate wave
forms do not turn on at same time.
This circuit creates PWM wave form
after comparing triangular wave form
and analogue signal .
Triangular Wave Former Circuit
PWM Wave Former
Dead Time Oscillation Circuit
2
1
receives mute signal from MUTE-2 terminal of u-COM,
and bias voltage of is short-circuited, and driver transistors
and final transistors on X08- get in condition of non-operation,
and shock noise is prevented.
Shock Noise Prevention Circuit
2
1
R179
510
10u16
+
33
R183
VR5
1.8K
R129
10K
R452
R456
10K
10K
R517
R513
47
R514
47
6.8K
R457
6.8K
R458
10K
R453
R454
10K
47u25
1K
R516
+
u-COM
"MUTE-2"
10K
R451
C464
R448
10K
B
10K
R455
+B
220
C151
D153
D151
D435
Q429
Q426
Q427
Q428
D431
Q159
5
3
4
5
