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