Circuit Descriptions
7.
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 the audio amplifier
•
+1V5, from the power supply for the scaler IC NT72666
•
+1V1, from the power supply for the scaler IC NT72666
•
+3V3, from the power supply for the scaler IC NT72666
•
+2V5, from the power supply for the scaler IC NT72666
•
+1V5, supply voltage for DDR2 (diagram B03B)
•
+5V, supply voltage for USB and CAM
•
+3V3-TUN, supply voltage for tuner
•
+5V_SW, input intermediate supply voltage for USB
•
+1V2_T2, voltage for Tuner T2_Decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
Figure 7-3 DC/DC converters
7.4
Front-End Analogue and DVB-T, DVB-C;
ISDB-T reception
7.4.1
Front-End Analogue and DVB-T/C part
The Front-End for DVB-T/C DTV part consist of the following
key components:
•
TUNER EU DTOS40CIL034B
•
SCALER NT72666BG-BA/D HS-PBGA-1135
Below find a block diagram of the front-end application for
DVB-T/C DTV part.
6
GND
n.c.
GND
n.c.
7
GND
n.c.
GND
n.c.
8
GND
-VLED2
GND
LED2
9
+12V-A
-VLED2
+12V-A
LED2
10
+12V-A
-VLED2
+12V-A
LED2
11
+12V
n.c.
+12V
n.c.
12
+12V
+VLED
+12V
VLED
13
+12V
-
+12V
-
14
+12V
-
+12V
-
15
+3.5V/5V
-
+3.5V
-
16
+3.5V/5V
-
+3.5V
-
Number
Connector
43"&49"
55"
CN9303
CN8101
CN9101
CN8601
Descriptio
n
to SSB
to panel
to SSB
to panel
Pin
16
12
16
12
NT72666
+5V_SW
PWR_ON_2
460 mA
500 mA
MAIN CHIP
MAIN CHIP
BUCK CONVERTER
TUNER
MAIN CHIP
640 mA
SI2166
U201
PANEL_T-CON
NT78822
U201
AO4449(7A)
Q701
14mA
+5V_SW
DV15
+5V_STB
PWR_ON_2
455 mA
BUCK CONVERTER
TCL_Tuner
DVB-C/T/T2
PWR_12V
PWR_ON_2
S2_DEMOD
CI CARD PWR
AVDD1V2
POWER protect
USB multi-media
DV11
Depend on panel
G5250M1T1U
U102
NT72666BG
+5V_STB
PCMCIA CARD
3964 mA(5V)
FB751
MX30LF2G18AC-TI
1650mA
BUCK CONVERTER
1mA
FB411
PANEL_22"~55"
AD87588
FB750
80 mA
G5309QN1U(8A)
U702
MAIN CHIP
+3V3_TUNER
12mA
+5V_SW
FB412
PANEL_VCC_ON/OFF
AP3417C(1A)
U705
AUDIO AMP
6500mA
PANEL_VCC
POWER SWITCH
USB
MAIN3V3
80 mA
T2_DEMOD
AON4421
Q750
LVDS_VDD
LDO
1367 mA
200 mA
AZ1117CD
U204
POWER SWITCH
+5V_SW
+12V_SW
AUDIO_12V
+5V_SW
VCC_CI
1367 mA
1mA
IR,LED
+5V_SW
AP2125N
-3.3TRG1
U707
TUNER
230 mA
PWR_ON_2
PWR_12V
1300mA
500 mA
MHL
14mA
STBC3V3
LDO
+5V_STB
455 mA
BUCK CONVERTER
DDR3 x4
600 mA
800 mA
900 mA
300 mA
MAIN CHIP
MAIN2V5
AP3417C(1A)
U703
NT72666BG
+5V_SW
BUCK CONVERTER
2950 mA(5V)
1367 mA
NT72666
230 mA
BUCK CONVERTER
NAND FLASH
LG_Tuner
DVB-S/S2
1.3A
LNB POWER
NT72666
TPS54428(4A)
U706
CI_PWR_EN
MP8126
U202
+5V or +12V
AZ1117_1.35A
U203_SOT-223
1700 mA
RT8079ZQW(3A)
U709
1500 mA
19970_202.eps
