Sanyo DC-MCR50 Service Manual page 12

IC BLOCK DIAGRAM & DESCRIPTION
IC903 LC6541D (4 ch. Bridge CD Driver)
Vcc Vref VIN4 VG4
24 23 22 21
11k Ω
Level
Sift
Level
Sift
11k Ω
1 2 3 4
Vcc Mute VIN1 VG1
IC904 LC1641 (Motor Driver)
P1 OUT1 VCC2 OUT2 P2
3 8
INPUT LOGIC CIRCUIT
IN1 5
GND
1
Input Output
IN1 IN2 OUT1 OUT2
0 0 0 0
1 0 1 0
0 1 0 1
1 1 0 0
Vo8 Vo7 GND
20 19
Vcc
BTL
Driver
BTL
Driver
5 6
Vo1 Vo2 GND
VCC
9
10 7
PRE-
VZ
4
DRIVE
IN2
6
Action
Brake
Normal(Reverse)Rotary
Reverse(Normal)Rotary
Brake
Vo6 Vo5 VG3 VIN3 CD
18 17 16 15 14
11k Ω
BTL Level
Driver Sift
BTL Level
Driver Sift
11k Ω
7 8 9 10 11
Vo3 Vo4 VG2 VIN2 Reg OUT Reg IN
IC301 LA4725 ( Power)
2
Ripple
filter
Predriver
1 +
IN
ñ
Predriver
BIAS
3
circuit
Standby
4
SW
Predriver
6 +
IN
ñ
Predriver
Pop noise
prevention
circuit
5 7
- 11 -
RES
13
RESET
Regulator
12
Output pin-to-V CC
short protector
Power
Load short
protector
Power
Output pin-to-GND
short protector
Overvoltage/
V CC
surge protector
Thermal
Output pin-to-GND
shutdown
short protector
Power
Load short
protector
Power
Output pin-to-V CC
short protector
14
13
12
11
9
Power
10
GND2
8