Samsung HPR4272X/XAC, Service Manual

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Circuit Description
13-6 Samsung Electronics
1. Outline (PDP 42inch SMPS)
Considering various related conditions, the switching regulator with good efficiency and allowing for its small size and light weight
was used as the power supply for PDP 42inch, VS requiring high power consumption used flyback converter.
2. Input
The power supply shall be capable of supplying full rated output power over 100 VAC - 120 VAC RMS nominal.
Operating voltage : 90 VAC - 132 VAC
The power supply must be able to start up under peak loading at 90V AC. The power supply shall automatically recover from AC
power loss. (Note that nominal voltages for test purposes are considered to be /- 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 10 output switching power supply for PDP 42inch. The output voltage, and current requirements for continu-
ous operation are stated below. (Table 1)
Table 1. Specification of Output Power Supplies for PDP SMPS
4. Over Voltage Protection
The over voltage sense circuitry and reference shall reside in package that are separate and distinct from the regulator control cir-
cuitry and reference. No single point fault shall be able to cause a sustained over voltage condition on any or all outputs. The sup-
ply shall provide latch-mode Over Voltage Protection as defined below. (Table 2)
Table 2. Over voltage Protection
Output Name Output Voltage Output Current(Max.) Using in PDP Driving
VS +190V ~ 220V (210V) 1.4A Sustain Voltage of Drive Board
VA +60V ~ 80V (70V) 0.6A Address Voltage of Drive Board
VG +15V 1.0A Driving Voltage of Fet
D12V +12V 1.0A
A12V +12V 0.3A
6.5V +6.5V 2.5A
D5.3V +5.3V 4.0A IC Driving Voltage of Logic Board
18VAMP +18V 2.0A Amp Voltage of Audio Board
VT +33V 0.006A
STD_5V +5V 1.0A Standby for Remote Control
Parameter Min Unit
VS(210V) 250 ~ V
VA(70V) 100 ~ V
D6.5V 6.8 ~ V