3
KAC-9104D
COMPONENTS DESCRIPTION
●
AUDIO UNIT (X09-8750-10)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
Isolation ampli
fi
er
Isolates noises caused by potential differences in GND
IC2
Phase
Change phase (0°
→
180°)
IC3
INFRA SONIC FILTER
Cuts off ultra low frequency of audio signal
IC4
LOW PASS FILTER
Cuts off high frequency of audio signal
IC5
BASS BOOST
Bass boost (Variable level)
IC6 (1/2)
Triangular wave generation
Generates reference signal for digitalizing analog signal
IC6 (2/2)
Error ampli
fi
er
Compensates errors by feedback from the output
IC7
Comparator
Digitalizes by comparing analog signal with triangular waves
IC8,9
NAND
Generates and shapes the inverted waveform and to create dead time in D-
class section
IC10,11,14 Resonance detection circuit
Detects short in SP output circuit, measures over current in the circuit, and
activates the protection operation
IC13
Comparator, Control circuit
Controls D/D CON and D-class On/Off with the over current detection and
Pcon control signals
IC15
DC/DC converter IC
Generates drive signal for switching component
IC16 (1/2)
Attenuation circuit to attenuate input signal by 6dB
Attenuates output when temperature in the set becomes too high
IC16 (2/2)
Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes high
IC17 (1/2)
Power supply voltage PWM control
Controls the dead time of DC/DC converter when the power supply voltage in
the secondary side becomes too high. Prevents the power supply from pumping
IC17 (2/2)
Temperature protection
Turns off DC/DC converter when temperature in the set becomes too high
Q1-3
PCON switch
Turns on the circuit when ON signal is applied to the PCON circuit
Q4,5
AUTO Pcon
Sends DC voltage from SP IN to Pcon control circuit
Q6,7
Mute
Generates mute drive signal and turns off LED
Q8,9
DC/DC converter ON/OFF control
Turns off DC/DC converter when protection is detected
Q10
4.4V AVR
Vef 5V reference AVR
Q11,12
DC/DC converter pulse ON/OFF control
ON or OFF of DC/DC converter drive waveform
Q13-16
Gate driver
Gate driver in DC/DC converter FET
Q17-22
DC/DC converter
DC/DC converter switching
Q23
FAN drive
Limits FAN power supply voltage under the rated voltage
Q24-27
AVR
±15V AVR
Q28,29
Tracking when ±15V AVR is turned OFF
Matches the trailing edge of “-15V” AVR with that of “+15V” AVR
Q30
HB 15V AVR
Stacking AVR to obtain High+B for D-class
Q101,113
D-class ampli
fi
er switch
Turns the D-class ampli
fi
er ON or OFF
Q102-112
Pulse ampli
fi
cation, shaping and level shift
Generates the signal that drives the D-class
fi
nal FET
Q301-304
Current-voltage conversion
Converts current to voltage to detect over current and sends it to the comparator
Q305,306
Resonance detection circuit
Detects short in SP output circuit, measures over current in the circuit, and
activates protection operation
Q307-311
Latch circuit
Detects abnormal output DC voltage and retains it
Q312
Comparator, Control circuit
Controls D/D CON and D-class On/Off with the over current detection and
Pcon control signals
Q313
Attenuation circuit to attenuate input signal by 1.5dB Attenuates output when temperature in the set becomes high
Q314
Attenuation circuit to attenuate input signal by 6dB Attenuates output when temperature in the set becomes too high
Q315
Mute
Turns off audio signal
Q701-704
Electric power ampli
fi
cation
Switching of D-class high current
