KAC-6402
2
BLOCK DIAGRAM
+6dB
0dB
+29.5dB
ISOLATION
AMPLIFIER
LINE IN
AL
ST/MONO
Ach
INPUT
GAIN
CONT.
LINE IN
AR
AMPLIFIER
ISOLATION
ISOLATION
AMPLIFIER
ST/MONO
AMPLIFIER
ISOLATION
SPEAKER
INPUT
GAIN
CONT.
Bch
INPUT
BR
LINE IN
LINE IN
BL
LPF+6dB
HPF
HPF
LPF+6dB
LPF+6dB
HPF
LPF+6dB
HPF
MUTE
AMPLIFIER
POWER
POWER
AMPLIFIER
AMPLIFIER
POWER
POWER
AMPLIFIER
OUT BR
SPEAKER
SPEAKER
OUT BL
OUT AR
SPEAKER
OUT AL
SPEAKER
CONVERTER
DC/DC
AVR
15V
OVER ROAD PROTECTION
DC DETECT AND
THERMAL
PROTECTION
PROTECTION
OVER VOLTAGE
P CON CIRCUIT
P CON
BATTERY
A-AB
+1
-1
+1
-1
FREQ. CONT.
FREQ. CONT.
COMPONENTS DESCRIPTION
●
AUDIO UNIT (X09-5890-10)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1,3
Buffer amplifier
Lowers impedance and amplify by 6dB
IC2,4
Isolation amplifier
Reduces common mode noise
IC5,9
Buffer amplifier
Rch operates as reverse amplifier
IC6,10
Reverse buffer amplifier
Reverse amplifier operation of 6dB
IC7,8,11,12
LPF/HPF
LPF and HPF with variable cut off
IC13
DC-DC converter
Oscillation and control of DC-DC converter
Q3,4
Constant voltage power supply
Constant voltage control of
±
15V
Q5,6
DC-DC converter
Switching FET
Q7,8,9,10
DC-DC converter
Gate driver for Q5,6
Q11,12
DC-DC converter
ON/OFF of IC13 output
Q101,102,201,202
Input mute circuit
Shock noise absorption at power ON/OFF
Q103~106,203~206
Power amplifier
First step differential absorption
Q107~110,207~210
Power amplifier
Second step differential absorption
Q111,112,211,212
Power amplifier
Second step current mirror load
Q113,114,213,214
Power amplifier
Power amplification circuit bias temperature compensation
Q115~118,215~218
Power amplifier
Excess current detection
Q119~122,219~222
Power amplifier
Power amplification step darlington driver
Q123~126,223~226
Power amplifier
Power amplification step darlington output transistor
Q601
B-class step mute
Mute signal generation circuit: Normally ON
Q602
Mute circuit
Mute signal generation circuit: Normally OFF
Q603
Input mute
Mute signal generation circuit: Normally OFF
Q604
Power ON/OFF
Primary power supply control transistor: Normally ON
Q605
Power ON/OFF
Power control circuit
Q606
Power ON/OFF
Excess voltage protection circuit: Goes OFF when primary input voltage of 16V or less
Q610
Excess current detection
Goes ON when detecting excess current and turns OFF DC-DC converter
Q611,612
DC output voltage detection
Goes ON when detecting DC output voltage from power amplifier
