Akai LCT32AD Service Manual page 71

Digital Power Amplifier
Fig.6 BTL operation mode(20W)
with PWM direct input
1u
PWM
STANDBY
Output
(BTL)
(note)
It may be need the
input Pre-LPF.
Fig.7 BTL operation mode without output LPF coil
If this speaker lines is very short, the LPF coil
is not needed.
４．７n
STANDBY
3p
IN
R for
GND
(47k)
R2S15102NP
0.1u
20 19
15uH Vz=27〜３０V
1
OUT1
2
VD1
0.1u
3
STBYL
4
PWM1
3p 150k
5
IN1
10k
6
10u
0.1u
20 19
Vz=27〜３０V
FB
1
OUT1
2
VD1
0.1u
R2S15102
3
STBYL
4
PWM1
150k
5
IN1
10k
0.47u
6
10u
8Ω
0.047u
10u
0.1u
18 17 16
15
OUT2
Exposed
14
VD2
Die Pad
R2S15102
13
MUTEL
12
PWM2
11
IN2
7 8 9 10
1k
22k 0.047u 10u
8Ω
0.047u
10u
0.1u
18 17 16
15
OUT2
Exposed
14
VD2
Die Pad
13
MUTEL
12
PWM2
11
IN2
7 8 9 10
1k
22k 0.047u
10u
69／129
(note)
"R for GND" 's are
for the evaluation only and
not needed actually.
0.1u 1000u
Vz=27〜３０V
15uH 1u
0.1u
150k 3p
47k
1u
(note)
The audio mute function must be
done by PWM signal.
0.1u 1000u
VD=+11〜25V
Vz=27〜３０V
４．７n
FB
0.1u
150k 3p
47k
1u
FB:Ferrite Beads
VD=+11〜25V
BTL Configuration
47k
MUTE
0.1u
R for
GND
(150k)
BTL Configuration
47k
MUTE
0.1u R for
GND
(150k)