KAC-PS650D/X650D
4
CIRCUIT DESCRIPTION
C373 0.82
C372 0.82
+
C369
33u50
+
70uH
C368
33u50
L302
47K
R497
C362
0.1
0.1
C363
C365
6800P
C370 0.82
1.5K
R503
10 1/2W
R378
10 1/2W
R388
R500
1.5K
680K
70uH
L301
C364
6800P
1.5K
R502
R501
R499
1.5K
R400
R397
R398
0.1
1/2W
R380
820
R392
47
R399
R394
R395
0.1
1/2W
R379
680
R391
47
0.01
C361
R361
1K
750
R377
1/2W
R390
1.5K
150
R382
R384
47K
1K
R389
120
510 1/2W
750
510 1/2W
DOWN-
GATE
UP-
GATE
47K
0.22
1/2W
R372
47K
R374
R373
R383
0.22
6
Q308
Q314
Q442
Q440
Q439
Q441
Q311
Q313
Q309
Q305
Q302
Q310
Q306
Q304
Q307
Q303
Q301
Q301-304 convert voltage of up-gate and down-gate to current.
R379,380 convert the current to voltage, and Q308-311 drive MOS-FETs Q313,314.
Swung PWM wave form is output to
±
B on line
6
, and the swung PWM wave form
is converted to analogue signal by LC filter.
Class-D Amplifier
