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_AMP for the AUDIO AMP.
•
3V3SB, permanent voltage for the Stand-by controller,
LED/IR, Wifi, keyborad receiver and controls.
•
+12V, input from the power supply for the panel
common(active mode)
•
+12V, input from the power supply for the AMP
•
DDRV supply voltage for DDR
•
TUNER_3.3V, supply voltage for tuner
•
USB_5V1, input intermediate supply voltage for the USB
Power
•
3V3SB, from the power supply for the scaler IC MT5580
•
DVDD3V3, +1V2,clean voltage for Demodulator IC
channel decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
Figure 7-3 DC/DC converters
5VSB
4A
MT5580
860mA
380mA
+12V
MOS- A4449
7A
SOP8
PANEL
G5655P12U
TUNER_3.3V
TUNER
USB *1
2A
SOP8
USB_5V1
TUNER_3.3V
1A
SOT223
G1117T63UF
3VSB
7A
SOP8
MOS- A4449
5V
50mA
5A
TO252
G1084-33TU3Uf
3.3V
MT5580
Demodulator IC
NAND Flash
810mA
5mA
30mA
AUDIO - STA381
983mA
3.2A
SOP8
PWM- AT1529
1.5V
DDR3
5A
SOP8
uP1734PSW8
1.2V
Demodulator IC
MT5580
DC-DC 1.2V
1A
SOT223
138mA
12V AMP
Amp
2416mA
650mA
1030mA
1.2V
+12VSB
G5759F11U
4A
SOP8
FB701
FB702
FB705
FB6001
+12VSB
1.13A @ 85%
303mA @85%
20080_202.eps