Circuit Descriptions
7.
7.3
DC/DC Converters
The on-board DC/DC converters deliver the following voltages
(depending on set execution):
•
PVDD from the power +12V_AU for the AUDIO AMP.
•
DRAM1V5 voltage for IC .NT726660 DDR when TV on
•
+12V, input from the power supply for the panel
common(active mode)
•
+5V_SW, input intermediate supply voltage for USB
Power/HDMI/CI
•
MAIN3V3,MAIN2V5 voltage for 78822
•
STB3V3, for IR/Key board /IC NT72666
•
Core0V9, for NT72666 core power
•
+3V3_TUNER, supply voltage for tuner
•
1.2V_T2, +3.3VA_T2 voltage for Demodulator IC channel
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
Figure 7-3 DC/DC converters
3
PS_ON
n.c.
PS_ON
n.c.
PS_ON/OFF
VLED-
4
n.c.
n.c.
PS_ON
n.c.
A3D
VLED-
5
GND
LED-
GND
LED-
GND
VLED-
6
GND
LED-
GND
LED-
GND
n.c.
7
GND
-
GND
-
GND
n.c.
8
GND
-
GND
-
GND
VLED-
9
+12VA
-
+12V_A
-
+12V_A
VLED-
10
+12VA
-
+12V_A
-
+12V_A
VLED-
11
+12V
-
+12V
-
+12V
n.c.
12
+12V
-
+12V
-
+12V
+VLED
13
+12V
-
+12V
-
+12V
-
14
+12V
-
+12V
-
+12V
-
15
+5.2v
-
+5v
-
NC
-
16
+5.2v
-
+5v
-
FLAG
-
Number
Connector
CN9101
CN8601
CN9101
CN8602
CN9101
CN8603
Description
to SSB
to panel
to SSB
to panel
to SSB
to panel
Pin
16
6
16
6
16
12
U702
G5309QN1U(10A)
BUCK CONVERTER
666_6300mA
PWR_ON_2
PWR_12V
+5V_STB
PWR_12V
880mA
U204
AZ1117(1A)
666_465 mA
666_900mA
666_15 mA
+1.2V_T2
U707
AP2125N
(300mA)
U709
RT8079ZQW(3A)
BUCK CONVERTER
LDO
DRAM1V5
DRAM1V5_EN
Q701
AON4421(6A)
MOS
U705
SY8088(1A)
BUCK CONVERTER
PWR_ON_2
MAIN2V5
MAIN3V3
BUCK CONVERTER
U703
SY8088(1A)
LDO
U203
AZ1117(1.35A)
+3V3_TUNER
Q701
AON4421(6A)
MOS
PANEL_VCC_ON/OFF
LNB
FB750
U202
MP8124(500mA)
LNB_EN
U102
G5250(?A)
CI_VCC_EN
CLASS D AMP
8W*2@6ohm speaker_1.33A(rms)
U601
AD87588
3.3A
800 mA
640 mA
CORE0V9
FB751
S tuner_145 mA
AUDIO_12V
+5V_SW
VCC_CI
T tuner_228 mA
580mA
16mA
STBC3V3
666_600 mA
375 mA
228 mA
1.7A(rms)
500 mA
500 mA
500 mA
1A
1A
1A
1A
500 mA
78822_300mA
U412
G529(1.2A)
U411
G5250(?A)
+5V_USB30
+5V_USB20
U515
G529(1.2A)
USB30_EN
HDMIA
78822_30mA
USB0_EN
+5V_SW
+5V_SW
+5V_SW
+5V_SW
MHL_CD_SENSE
POWER SWITCH
POWER SWITCH
POWER SWITCH
POWER SWITCH
940 mA
DDR3 X 4
MIN@ IDD6 =14mA*4 = 56mA
MAX@ IDD7 =400mA*4 =1.6A
2500 mA
2.2A
U706
TPS54528(5A)
BUCK CONVERTER
PWR_12V
PWR_12V
20140_202.eps