-18-
IC BLOCK DIAGRAM - 1/2
IC, LN4808
37
20
21
22
23
14
11
12
7
6
8
4
10
44
42
41
36
27
26
25
24
29
30
31
32
28
3
34
35
1
39
9
2
38
40
5
Switching
circuit
Thermal
shutdown
Absolute
value
Absolute
value
Starter SW
Initial setting
BTL
BTL
BTL
BTL
Starter
Trian-
gular
wave
PWM
Max.value
IN
SP
PC
IN
TV
AV
DD
SV
CC
TRVSTOP
CRIP
IN
PO
FB
SPRO
DED
AREF
Ripple
filter
POWER
OFF
TB
V
C
FO
TR
SP
TV
PWMG
I
OUT
PV
CC2
CLK
POWER
OUT
PGND
RESET
MRST
EMP
V
SEN
CT
PV
CC1
START
2
3
8
5
7
6
4
1
IN A(–)
IN A(+)
OUT A
IN B(+)
IN B(–)
OUT B
20k
Ω
20k
Ω
GND
VDD
IC, AN8789FB
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QQ 376315150
9
9
2
8
9
4
2
9
8
TEL 13942296513
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299