Aiwa XP-MP3 Service Manual page 20

IC BLOCK DIAGRAM - 2/3
IC, BH6508FS
IC, BA6655AFV
IC, MB3800PFV
POW
CLK GND IN-SP CN-SP O-SPF
32 31 30 29 28
F
20k
NF
AMP
20k
3.75k
H BRIDGE4
LOGIC4
SWA
OSC
LOGIC1
20k
NF
AMP
1k
20k
1 2 3 4 5
SP CT IN-FO CN-FO POW
CON GND
EO NF RESET
20 19 18
Vref1
Vref1
Starta
Normal
Vref1
Vref1
Switching
1 2 3
VSYS VSEN1 SW
VCC
3
0.6V
Ref. Volage
0.1V
1.25v
IN 1
36k
Error Amp.
500
0.5V
FB 8
6
GND
POW POW POW
VCC O-SPR GND O-SLR VCC
27 26 25 24 23
R R
H BRIDGE3
PRE PRE
DRIVER4 DRIVER3
PRE
DRIVER1 DRIVER2
H BRIDGE1 H BRIDGE2
F R R
6 7 8 9 10
O-FOF POW O-FOR POW O-TOR
VCC GND
WP2 WP1 OFF VSEN2
17 16 15
Power Off
Starta
Triangular
OSC
4 5 6
GND PVCC OSC ROUT
OSC
7
Saw Tooth
OSC
0.1V
PWM
Comp.
Output Drive
DTC 0.6V
Soft Start
S.C.P
2
SCP
-20-
POW
O-SLF GND CN-SL IN-SL VG VCC
22 21 20 19 18 17
F
20k
VCC
NF
AMP
1k 20k
Thermal
shut down
LOGIC4
PRE
LOGIC2
20k
1k
NF
AMP
20k
F
11 12 13 14 15 16
POW O-TOF POW CN-TO IN-TO VREF
VCC GND
VREG PDR DCIN
14 13 12 11
Vref2
Vref2
Vref2
REG.
Power Power
Switch1 Switch2
7 8 9 10
PSW1 PSW2 BATT
5
30k
Controller
0.3V
4
BR/CT
VREF
OUT