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IC Block Diagrams
● LA7217 <Sync Separator,
IC2051, IC8041>
● MD1222N <DC-DC Converter, IC5204>
V ref
V cc
28
R/C
START UP
ON/OFF
START =7.2 V
5
C ircuit
STOP =6.7 V
R eference
5.0V ± 5%
E rror amp
–
+
2.45V
32
amp -
V boot
6
8
BOOT
R eference =6.5V
º
100
C
TSD
PWM C omp
+
–
OSC
f =2 50 k H z
30
amp OUT
● LB1641 <Motor Driver, IC1601, IC1611>
LB1645N <IC1621, IC1631>
VB
25
H igh S ide
V ref =V out +5.8V
º
150
C
U pper / lower MO S
S imultaneously O FF
U pper / lower MO S
P revent simultaneous ON
3V
1V
Q
+
R
S
–
CLM V th =
0.1~0.2V
1
S/S
-110-
VGH
23
H igh S ide
driver
L ow S ide
V ref =6.5V
L ow S ide
driver
2
3
4,26
9
OCL–
OCL+
GND
VGL
VDD
18~21
VOUT
11~14
P.GND
16
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