
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_AUD, input from the power supply for the AMP
•
+1V5, from the power supply for the scaler IC NT72453
•
+1V1, from the power supply for the scaler IC NT72453
•
+1V5, supply voltage for DDR2 (diagram B03B)
•
+3V3, genenal supply voltage
•
+5V, supply voltage for USB and CAM
•
+3V3-TUN, supply voltage for tuner
•
+3V3 from the power supply for the scaler IC NT72453
•
+5V_SW, input intermediate supply voltage for USB
•
+3V3_T2, voltage for Tuner single decoder
•
+1V2_T2, voltage for Tuner single decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
Figure 7-3 DC/DC converters
8
GND
-
GND
n.c.
9
+12V-AUDIO
-
+12V-A
-
10
+12V-AUDIO
-
+12V-A
-
11
+12V
-
+12V
-
12
+12V
-
+12V
-
13
+12V
-
+12V
-
14
+12V
-
+12V
-
15
n.c.
-
+5.2V
-
16
n.c.
-
+5.2V
-
Number
Connector
CN9101
CN8605
CN9101
CN8602
Description to SSB
to panel
to SSB
to panel
Pin
16
5
16
8
20190_202.eps
U401 MSD8220LB
U601 STA381
+3V3TUNER
U401 MSD8220LB
PANEL LVDS Pow er
Q702 AO4449-7A
For Audio Am plifier
U403 W25Q32FVSSIG
5V_SW
U705 APW7323
For MSD8220LB-S9
For MSD8220LB-S9
U707 G5655P12U
P12V
3V3_STB
VCCK
P12V_AUD
U701 AP1117E33L-13-77
For Reset IC
For SPI Flash
TU101 TUNER
DDRV
For MSD8220LB-S9
+12V_AUD
U401 MSD8220LB
Q104 AO4449-7A
+5VSB
U102 AP1117E33L-13-77
U405 G690H293T73
U406 AZ1084D-ADJTRE1
For TUNER 3.3V