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IC BLOCK DIAGRAM & DESCRIPTION
IC504 TC7SHU04FU(INVERTER)
NC
1
IN A
2
GND
3
IC480 KIA78R33PI(Voltage Regulator)
V
1
IN
BANDGAP
REFERENCE
OUTPUT ON/OFF
Control
4
CONTROL
IC816 74VHC244MTC (LINE DRIVER)
LOGIC DIAGRAM
A1
2
A2
4
A3
6
A4
8
DATA
INPUTS
B1
11
B2
13
B3
15
B4
17
OEA
1
OUTPUT
ENABLES
OEB
19
FUNCTION TABLE
INPUTS
OEA, OEB
A, B
L
L
L
H
H
X
V
5
CC
OUT Y
4
2
Vo
ASO
PROTECTION
OVER HEAT
PROTECTION
3
GND
18
YA1
PIN ASSIGNMENT
16
YA2
OEA
1
YA3
14
A1
2
YB4
3
12
YA4
NONINVERTING
A2
4
OUTPUTS
9
YB3
5
YB1
A3
6
7
YB2
YB2
7
A4
8
5
YB3
9
YB1
3
YB4
GND
10
OUTPUTS
YA, YB
L
H
Z
IC490 STR-G6651(Switch Regulator)
V
IN
4
START
O.V.P
REG.
T.S.D
Pin No.
Sym.
Description
1
D
Drain terminal
2
S
Source terminal
3
GND
Ground terminal
V
Power Supply terminal
4
IN
Overcurrent/Feedback
O.C.P/F.B
5
terminal
Overvoltage protection
-
O.V.P
circuit
Thermal shutdown
-
T.S.D.
circuit
IC815 24LC16BT(16K EFROM)
20
Vcc
OEB
19
YA1
18
17
B4
YA2
16
15
B3
YA3
14
13
B2
12
YA4
11
B1
- 58 -
LATCH
DRIVE
-
Vth(1)
+
O.S.C
Comp.1
-
Vth(2)
+
Comp.2
Function
MOS FET drain
MOS FET source
Ground
Input of power supply for control
circuit
Input of overcurrent detection signal
and constant voltage control signal
Overvoltage protection circuit
Terminal shutdown circuit
Name
Function
V
Ground
SS
SDA
Serial Address/Data I/O
SCL
Serial Clock
WP
Write Protect Input
V
+2.5V to 5.5V Power Supply
CC
A0,A1,A2
No Internal Connection
1
D
2
S
O.C.P/F
5
3
GND
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