Akai LCT3785TAJ, Service Manual

Page: 68 / 128

Digital Power Amplifier
R2S15102NP
５．
Pin Configuration(Table.1)
VD2
14
W BTL operation hen this is connected to DVDD pin via
the resister, Reversed signal of OUT1 is
output to OUT2.
Analog input #2(as same as IN1)
Power supply pin for power output stage #2
−
Ground pin for power output stage #1
− VS1
20
Capacitor connection pin for bootstrap #1 I/O
HB1
19
Capacitor connection pin for bootstrap I/O
HB2
17
Built-in power supply pin for internal digital block. O
DVDD
18
Ground pin for power output stage #2
− VS2
16
Power Output pin #2 O
OUT2
15
Mute control pin. When this is “L”, it becomes mute status. I
MUTEL
13
PWM input pin#2 ( for phase compensation)
SE operation
Protection Timer pin. At protection mode,the output
becomes “L”-level.
(The timing capacitor is connected)
Capacitor connection pin for analog block reference
voltage source
GND pin for analog block
Control pin for PWM carrier frequency
A capacitor is connected so that it may not be influenced of
power supply change(Ripple Filter).
Analog input #1. The gain is depended on the external
resistance .
PWM input pin #1 ( for phase compensation)
Stand-by control pin. When this is “L”, circuit current is
reduced.There is the pull-down resistor:50Kohm(typ.).
Power supply pin for power output stage #2
Power Output pin #1
Description
I
I
I
O
I/O
−
I
I/O
I
I
I
−
O
I/O
PWM2
IN2
PROT
VREF
GND
ROSC
CBIAS
IN1
PWM1
STBYL
VD1
OUT1
NAME
12
11
10
9
8
7
6
5
4
3
2
1
No.
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