Read Sharp LC-M3700 (serv.man9) Service Manual online
49
LC-M3700
LC-M3710
LC-M3710
49-1
49-2
Ë
VHiMB8346BV-1Y(ASSY:IC2006)
D/A CONVERTOR
»
Block Diagram
Pin No
.
Pin Name
I/O
Pin Function
17
DI
I
Data input terminal.
12-bit serial data is inputted.
14
DO
O
D
ata output terminal.
Bit data of MSB of a 12-bit shift register is outputted.
16
CLK
I
Shift clock input terminal.
Incoming signal from DI terminal is inputted into a 12-bit shift register in the
leading edge of a shift clock.
15
LD
I
Load signal input terminal.
An input of the "H" level loads the data of a 12-bit shift register to a decoder and
the register for an D/A output.
18
AO1
O
D/A output terminal.
19
AO2
O
Analog data of a 8-bit D/A converter with an OP amplifier is outputted.
2
AO3
O
3
AO4
O
4
AO5
O
5
AO6
O
6
AO7
O
7
AO8
O
8
AO9
O
9
AO10
O
12
AO11
O
13
AO12
O
11
Vcc
—
MCU interface and the power supply terminal of an OP amplifier.
20
GND
—
MCU interface and the ground terminal of an OP amplifier.
10
Vdd
—
Power supply terminal for D/A converter.
1
Vss
—
Ground terminal for D/A converter.
»
Pin Function
»
Pin Function
Ë
VHiMD1422N+-1Y(ASSY:IC1703)
DC-DC converter power IC
»
Block Diagram
Pin No
.
Pin Name
I/O
Pin Function
1
S/S
I
capacitor connection terminal for a soft start.
2
OCL-
I
Over(-) current-detection terminal.
3
OCL+
I
Over-current (+) detection terminal.
4,26
GND
—
GND terminal.
5
R/C
I
R
emote ON/OFF control terminal.
6
Vcc
—
Power supply terminal of a control circuit.
8
Vboot
I
Power supply terminal of a main switch and MOSFET control circuit.
9
VGL
I
Gate terminal of the Low side MOSFET for periodic rectification.
11~14
VOUT
O
Output terminal of the power stage.
16
P.GND
—
GND terminal of an output circuit.
18~21
VDD
—
Power supply terminal of the main switch MOSFET.
23
VGH
I
Gate terminal of the high side MOSFET for periodic rectification.
25
VB
I
Output bootstrap terminal.
Capacitor is connected between VB terminal and VOUT and the circuit for
control of MOSFET inside IC is bootstrapped.
27
VTS
—
Terminal for TEST. Please do not connect anywhere.
28
Vref
I
Internal standard voltage output terminal.
30
ampOUT
O
B
uilt-in error amplifier output terminal.
32
amp-
I
Built-in error amplifier reversal input terminal. .
7,10,15,17,
N/C
—
It is a no-connection terminal.
22,24,29,31
Click on the first or last page to see other LC-M3700 (serv.man9) service manuals if exist.