-105-
IC Block Diagrams
S1
S2
S2
S3
S1
M
5
6
1
4
8
+B
2
10
LOGIC
VZ
INPUT
INPUT
ON/OFF
CONTROL
FORWARD (reverse) DRIVE
REVERSE (forward) DRIVE
BRAKING
S1=ON , OTHER=OFF
S2=ON , OTHER=OFF
S3=ON , OTHER=OFF
<FF>
1
10
1
10
LB1645N
LB1641
●
LB1641 <Motor Driver, IC1601, IC1611>
LB1645N <Motor Driver, IC1621, IC1631>
–
+
+
–
+
–
Vref
Vcc
START UP
START =7.2 V
STOP
=6.7
V
BOOT
Reference=6.5V
High Side
Vref=Vout+5.8V
Upper/ lower MO S
Simultaneously O FF
High Side
driver
ON/O FF
Circuit
Reference
5.0V
±
5%
Vboot
VB
VGH
VDD
23
25
8
6
R/C
5
28
32
30
amp
-
amp
OUT
S/ S
1
OCL–
VGL
2
OCL+
3
GND
P.GND
VOUT
CLM Vth=
0.1~0.2V
TSD
Q
R
3V
1V
2.45V
Low Side
Vref=6.5V
S
Error amp
PWM C omp
100
º
C
150
º
C
Low Side
driver
4,26
18~21
11~14
Upper/ lower MO S
Prevent simultaneous ON
9
16
OSC
f
=2 50kHz
●
MD1222N <DC-DC Converter, IC8191>
Содержание LC-XT4E
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