Philips 22PFL3108H/60 Service Manual page 43

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 AMP
• +1V5, from the power supply for the scaler IC NT72567
• +1V1, from the power supply for the scaler IC NT72567
• +1V5, supply voltage for DDR2 ( diagram B03B)
+12V
+12V_PWR RT7257AHZSP
Soft Start
LDO
AS7805DTR-E1 5v LM1108SF
U704
Depend on panel
POWER SWITCH
+12V
AON4421
+5V_STB
Q750
PANEL_VCC_ON/OFF
BUCK CONVERTER
5V_STB +5V_STB G5173R41D DV11
U701
POWER SWITCH
+5V_STB AON4421 +5V_SW
Q701
PWR_ON
12V
FB603
FB604
12V
Q706
5V-STB
AON4421
Figure 7-8 DC/DC converters ( for 32" & 39")
Circuit Descriptions
• +3V3, genenal supply voltage
• +3V3-TUN, supply voltage for tuner
• +3V3 from the power supply for the scaler IC NT72567
• +3V3-DVBS, clean voltage for DVB-S2 channel decoder
• +1V2-DVBS, core voltage for DVB-S2 channel decoder
Figures gives a graphical representation of the DC/DC
converters with its current consumptions :
AUDIO AMP
+12V
AD82587D
+5V_STB
5V_STB
PWR_ON
DV33SB
PANEL_T-CON
+5V or +12V
MAIN CHIP
<1820mA NT72568
USB multi-media
500 mA
USB PWR
LDO SILICON TUNER
+5V_SW G1084-33 <230 mA +5V_TUNER
ST03CS-2-E
U101
PCMCIA CARD
POWER protect
CI CARD
+5V_SW G5250M1T1U VCC_CI
PWR
U102
CI_PWR_EN
LDO MAIN CHIP
G1084-33TU3Uf
+5V_SW <170 mA DV33 NT72568
U702
LDO MAIN CHIP
DV33 AZ1117D DV15 NT72568
<370 mA
U703
LDO MAIN CHIP
<290 mA
+5V_SW G1084TU3UF AV25 NT72568
U705
PVDD
AMP STA381BWTR
PANEL_VCC
back to
div. table
TPN10.1E LA
1mA
MAIN CHIP NAND FLASH
<10mA NT72568 K9F1G08U0D
-SIB0
PANEL
<210 mA DDRIII
DV15 K4B2G1646E
-BCH9
7. EN 43
19530_205_130807.eps
130807
2013-Oct-18