3
KAC-8104D
COMPONENTS DESCRIPTION
●
AUDIO UNIT (X09-8730-10)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
DC/DC converter IC
Generates drive signal for switching component
IC11
Isolation amplifi er
Isolates noises caused by potential differences in GND
IC12,13
NAND
Generates and shapes the inverted waveform and to create dead time
in D-class section
IC14
INFRA SONIC FILTER
Cuts off ultra low frequency of audio signal
IC15
BASS BOOST
Bass boost (Variable level)
IC18
LOW PASS FILTER
Cuts off high frequency of audio signal
IC31 (1/2)
Triangular wave generation
Generates reference signal for digitalizing analog signal
IC31 (2/2)
Comparator
Digitalizes by comparing analog signal with triangular waves
IC32 (1/2)
Triangular wave generation
Generates reference signal for digitalizing analog signal
IC32 (2/2)
Error amplifi er
Compensates errors by feedback from the output
IC60
Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too high
IC61,62,64
Resonance detecting circuit
Detects short in SP output circuit, measures over current in the circuit,
and activates protection operation
IC63
Comparator
Controls D/D CON and D-class On/Off with the over current detection
and Pcon control signals
Q1-3
PCON switch
Turns on the circuit when ON signal is applied to the PCON circuit
Q4,5
Mute
Generates mute drive signal and turns off LED
Q6
DC/DC converter ON/OFF control
Turns off DC/DC converter when protection is detected
Q8-11
Gate driver
Gate driver in DC/DC converter FET
Q12,13,19,20
DC/DC converter
DC/DC converter switching
Q25,26,28,42
AVR
±15V AVR
Q29,30
Tracking when ±15V AVR is turned OFF
Matches the trailing edge of “-15V” AVR with that of “+15V” AVR
Q37,38
DC/DC converter pulse ON/OFF control
ON or OFF of DC/DC converter drive waveform
Q51,52
AUTO Pcon
Sends DC voltage from SP IN to Pcon control circuit
Q151
Mute
Turns off audio signal
Q400,403
D-class amplifi er switch
Turns on or off D-class amplifi er
Q401,402
Pulse amplifi cation, shaping and level shift
Generates the signal that drives the D-class fi nal FET
High-current switching in D-class
Stacking AVR to obtain High+B for D-class
Detects short in SP output circuit, measures over current in the circuit,
and activates protection operation
Turns off DC/DC converter when protection is detected
Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes too high
Current-voltage conversion
Converts current to voltage to detect over current and sends it to the
comparator
Q608-611
Latch circuit
Detects over voltage in output and retains the current
Q900
FAN drive
Limit FAN power supply voltage under the rated voltage
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