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7.3
DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
•
+5V-STANDBY, permanent voltage for the Stand-by
controller, LED/IR receiver and controls
•
+12V, input from the power supply for the panel common
(active mode)
•
+12V, input from the power supply for audio amplifier
•
+1V2, from the power supply for the scaler IC MT5580
•
+1V5, supply voltage for DDR2 (diagram B03B)
•
+3V3, general supply voltage
12V AMP
7.4
Front-End Analogue and ISDB-T reception
7.4.1
Front-END Analogue part
The Front-End for Analogue tuner consist of the following key
components:
•
TUNER USA TDST-H080F
•
SCALER MT5580QUEI PBGA-511TV Processor
Connector
Number
CN9101
CN9101
Description
to SSB
to SSB
Pin
14
14
4
n.c.
2D/3D
5
GND
GND
6
GND
GND
7
GND
GND
8
GND
GND
9
+12V_AUDIO +12V_AUDIO +12V_AUDIO +12V_AUDIO -
10
+12V_AUDIO +12V_AUDIO +12V_AUDIO +12V_AUDIO -
11
+12V
+12V
12
+12V
+12V
13
+12V_AL
+12V_AL
14
+12V-AL
+12V-AL
FB701
+12V
FB702
U704
G5759P11U
5VSB
4A
SOP8
FB705
AMP STA381BWTR
FB6001
Figure 7-3 DC/DC converters
Circuit Descriptions
CN9301
CN9301
CN8101
to SSB
to SSB
to panel
14
14
8
n.c.
n.c.
n.c.
GND
GND
VLED-
GND
GND
VLED-
GND
GND
n.c.
GND
GND
n.c.
+12V
+12V
-
+12V
+12V
-
+12V
+12V_AL
-
+12V
+12V-AL
-
•
+3V3-TUN, supply voltage for tuner
•
+5V-USB, input intermediate supply voltage for USB
Power
•
+3V3 from the power supply for the scaler IC MT5580
•
+12V, input from the Power supply for the Ambilight
common.
•
+3V3-DVBS, clean voltage for Demodulator IC channel
decoder.
Figures gives a graphical representation of the DC/DC
converters with its current consumptions:
MOS-A4449
7A
SOP8
G5655P12U
2A
SOP8
50mA
G1117T63UF
3V3SB
1A
SOT223
5V
PWM-AT1529
MOS-A4449
7A
3.2A
SOP8
SOP8
G1084-33TU3UF
5A
TO252
UP1734PSW8
1.2V
5A
SOP8
Below find a block diagram of the front-end application for the
front-end application for analogue part.
back to
div. table
TPM14.2L LA
7.
CN8101
CN8101
CN8101
to panel
to panel
to panel
12
12
12
LED1-
VLED_1
VLED-
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
n.c.
VLED2-
VLED_2
VLED-
VLED2-
VLED_2
VLED-
n.c.
n.c.
n.c.
VLED2+
VLED+
VLED+
-
-
-
-
-
-
Panel
5V_USB
TUNER_3.3V
Tuner_3.3V
USB*1
MT5580
800mA
1.5V
DDR3
MT5580
3.3V
Demond IC
NAND flash
Audio-STA381
DC-DC 1.2V
1.2V
1A
SOT223
4A
MT5580
EN 35
300mA
Tuner
Demond IC
19640_202.eps
2014-Feb-28
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