Akai LCT42Z7TAP, Service Manual

Page: 72 / 130

Digital Power Amplifier
R2S15102NP
STBYL
RO
S
C
OUT1
HB1
VD1
VS1
IN1
MUTEL
CB
IA
S
AV
D
D
OUT2
VD2
VS2
PR
OT
HB2
DV
D
D
IN2
GN
D
3
4
2
5
1
9 8 7 10 6
14
15
11
12
13
16 17 18 20 19
PWM2 PWM1
47k
10u 22k
8Ω
R2S15102
10u
0.1u 0.1u
3p 150k 150k 3p
STANDBY
47k
0.1u 0.1u
0.1u 1000u
0.047u
R for
GND
(150k)
15uH Vz=27〜３０V
Vz=27〜３０V
Fig.7 BTL operation mode without output LPF coil
STBYL
RO
S
C
OUT1
HB1
VD1
VS1
IN1
MUTEL
CB
IA
S
AV
D
D
OUT2
VD2
VS2
PR
OT
HB2
DV
D
D
IN2
GN
D
3
4
2
5
1
9 8 7 10 6
14
15
11
12
13
16 17 18 20 19
PWM2 PWM1
47k
10k
0.47u
10u
22k
8Ω
R2S15102
10u
0.1u 0.1u
3p 150k 150k 3p
STANDBY
47k
0.1u 0.1u
0.1u 1000u
0.047u
R for
GND
(150k)
Vz=27〜３０V
FB
FB
If this speaker lines is very short, the LPF coil
is not needed.
PWM
Output
(BTL)
(note)
It may be need the
input Pre-LPF.
Exposed
Die Pad
Exposed
Die Pad
0.1u
1u
(note)
“R for GND” ‘s are
for the evaluation only and
not needed actually.
(note)
The audio mute function must be
done by PWM signal.
1k
1k
Fig.6 BTL operation mode(20W)
with PWM direct input
VD=+11〜25V
0.047u
1u
1u 15uH
BTL Configuration
MUTE
10k
10u
VD=+11〜25V
0.047u
Vz=27〜３０V
４．７n
４．７n
BTL Configuration
MUTE
IN
0.1u
R for
GND
(47k)
10u
1u
FB:Ferrite Beads
70／128