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EN 24
7.
TPR14.1A LA
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
•
+3V3-STANDBY, power supply for LED/IR receiver and
controls
•
+12V, input from the power supply for the panel common
(active mode)
•
+12V, input from the power supply for the amplifier
•
+1V5, supply voltage for DDR
+12V
D12V_IN
7.4
Front-End Analogue ATV reception
7.4.1
Front-End Analogue Part
The Front-End for the analogue tuner consist of the following
key components:
•
TUNER China DTOS40CVH033A
2014-Jul-18
Circuit Descriptions
Connector
32"
no.
CN9101
CN8501
Descr.
to SSB
to panel
Pin
14
8
5
GND
VLED-
6
GND
VLED-
7
GND
n.c.
8
GND
n.c.
9
+12V_AUDIO
-
10
+12V_AUDIO
-
11
+12V
-
12
+12V
-
13
+12V_AL
-
14
+12V_AL
-
D5V_STB
U701
POWER_ON_LV2
1.0V(VCCK)
U705
Panel_EN
Figure 7-3 DC/DC converters
42"
CN9101
CN8101
to SSB
to panel
14
12
GND
n.c.
GND
n.c.
GND
n.c.
GND
n.c.
+12V_AUDIO
VLED_2-
+12V_AUDIO
VLED_2-
+12V
n.c.
+12V
VLED_2+
+12V_AL
-
+12V_AL
-
•
+3V3, general supply voltage
•
+3.3V-TUN, supply voltage for tuner
•
+3.3V, supply voltage for Headphone AMP
•
+5V-USB, input intermediate supply voltage for USB
Power
•
+3V3, from the power supply for the scaler IC RTD2644DD
Figures gives a graphical representation of the DC/DC
converters with its current consumptions:
A3V3
0.3A
IO_3V3, UART, Keypad, LVDS_3V3, LSADC_3V3,
U702
D3V3
HDMI_3V3, ADC_3V3, BB_3V3, IFDADC_3V3, USB_3V3
POWER_ON_LV2
U704
D_5V
1.0V(VCCK)
U703
D_5V
Q704
D_5V
Q403
Audio AMP
AMP_VDD
•
SCALER RTD2644DD LQFP 176
Below find a block diagram of the front-end application for
analogue part.
back to
div.table
48"
CN9301
CN8101
to SSB
to panel
14
12
GND
n.c.
GND
n.c.
GND
n.c.
GND
n.c.
+12V_AUDIO
VLED_2
+12V_AUDIO
VLED_2
+12V
n.c.
+12V
VLED+
+12V
-
+12V
-
Q701
M3V3 for SPI flash
1.5V
DDR Power DDR3: 1.5V
ADC, VDC, APLL
A1V0
D1V0(Core Power)
3.3V
Silicon Tuner 3.3V
U101
USB_5V
Panel
19720_202.eps
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