Samsung PDP4298EDX/SMS, Service Manual

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Circuit Operation Description
5-4 Samsung Electronics
5-3-2 Circuit Description
1. Outline (PDP42inch SMPS)
Considering various related conditions, the switching regulator with good fficiency and allowing for its
small size and light weight was used as the power supply for PDP 50inch (Alexander), VS requiring high
power consumption used Asymmetrical Half Bridge converter and flyback converter and other high volt-
age (VSCAN, VSET, VE) used DC/DC converter. To comply with the international harmonics standards
and improve the power factor, active PFC(Power Factor Correction) was used to rectify AC input into
+400V DC output, which in turns used as input to the switching regulator.
2. INPUT
The power supply shall be capable of supplying full rated output power over free voltage ranges that are
rated 100 VAC -240 VAC RMS nominal. Operating voltage : 90 VAC - 264 VAC
The power supply must be able to start up under peak loading at 90V AC. The power supply shall auto-
matically recover from AC power loss. (Note that nominal voltages for test purposes are considered to be
with +/- 1.0V of nominal).
STD_5V is a SELV standby voltage that is always present when AC mains voltage present.
3. OUTPUT
This power supply is 15 output switching power supply for PDP 42inch(Alexander). The output voltage,
and current requirements for continuous operation are stated below. (table 1)
Table1. Specifications of Output Power Supplies for PDP SMPS
Output Name
VS
VA
VSCAN
VSET
VE
VG
D12V
A12V
D6V
A6V
D5V
D3.3V
12V AMP
VT
STD_5V
Output Voltage
+75V ~ 100V (89V)
+65V ~ 80V (78V)
+65V ~ 100V (75V)
+80V ~ 10V (95V)
+100V ~ 120V (110V)
+15V
+12V
+12V
+6V
+6V
+5V
+3.3V
+12V
+33V
+5V
Output Current(Max)
4.5A
0.6A
0.1A
0.1A
0.1A
1.5 A
0.1A
0.3A
0.1A
0.1A
1.0A
4.5A
1.7A
0.003A
0.6A
Using in PDP driving
Sustain Voltage of Drive Board
Address Voltage of Drive Board
Driving Voltage of Fet
IC Driving Voltage of Logic Board
Amp Voltage of Audio Board
Stand-by for Remote Control