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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.
•
+3V3, supply voltage for Keyboard
•
+12V, input from the power supply for the panel
common(active mode)
•
+12V, input from the power supply for the AMP
•
+1V2, from the power supply for the scaler IC MT5561
•
+1V5, supply voltage for DDR2 ( diagram B03B)
•
+3V3, genenal supply voltage
•
+3V3-TUN, supply voltage for tuner
•
+5V-USB, input intermediate supply voltage for the USB
Power
•
+3V3 from the power supply for the scaler IC NT72567
•
+3V3-DVBS, clean voltage for DVB-S2 channel decoder
•
+1.1V, clean voltage for Demod channel decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
Figure 7-4 DC/DC converters (for
32"/39"/40"/42"/47"/50"PxG4109/7x
)
3
n.c.
PS_ON
PS_ON
n.c.
VLED-
VLED+
n.c.
LED1-
4
n.c.
n.c.
n.c.
n.c.
VLED-
VLED+
n.c.
LED1-
5
GND
GND
GND
GND
n.c.
LED3
VLED-
n.c.
6
GND
GND
GND
GND
n.c.
LED4
VLED-
n.c.
7
GND
GND
GND
GND
n.c.
n.c.
n.c.
n.c.
8
GND
GND
GND
GND
n.c.
n.c.
n.c.
n.c.
9
+12V-AUD
IO
+12V-AUD
IO
+12V-AUD
IO
+12V-AUDIO VLED-
-
-
LED1-
10
+12V-AUD
IO
+12V-AUD
IO
+12V-AUD
IO
+12V-AUDIO VLED-
-
-
LED1-
11
+12V
+12V
+12V
+12V
n.c.
-
-
n.c.
12
+12V
+12V
+12V
+12V
VLED-
-
-
LED1+
13
+12V_AL
+12V_AL
+12V_AL
+12_AL
-
-
-
-
14
+12V_AL
+12V_AL
+12V_AL
+12_AL
-
-
-
-
Connector
Number
CN9101
CN9101
CN9301
CN9904
CN8101
CN8101
CN8501
CN8501
Description
to SSB
to SSB
to SSB
to SSB
to panel
to panel
to panel
to panel
Pin
14
14
14
14
12
8
8
12
19620_202_140111.eps
140111
Q401
A04449-7A
AMP STA381BWTR
Q711
PANEL_VCC
PVDD
12V
12V