Samsung HPR4272X/XAC Service Manual

Circuit Description13-6 Samsung Electronics1. Outline (PDP 42inch SMPS)Considering various related conditions, the switching regulator with good efficiency and allowing for its small size and light weightwas used as the power supply for PDP 42inch, VS requiring high power consumption used flyback converter.2. InputThe power supply shall be capable of supplying full rated output power over 100 VAC - 120 VAC RMS nominal.Operating voltage : 90 VAC - 132 VACThe power supply must be able to start up under peak loading at 90V AC. The power supply shall automatically recover from ACpower loss. (Note that nominal voltages for test purposes are considered to be within +/- 1.0V of nominal).STD_5V is a SELV standby voltage that is always present when AC mains voltage present.3. OutputThis 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 SMPS4. Over Voltage ProtectionThe 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 ProtectionOutput Name Output Voltage Output Current(Max.) Using in PDP DrivingVS +190V ~ 220V (210V) 1.4A Sustain Voltage of Drive BoardVA +60V ~ 80V (70V) 0.6A Address Voltage of Drive BoardVG +15V 1.0A Driving Voltage of FetD12V +12V 1.0AA12V +12V 0.3A6.5V +6.5V 2.5AD5.3V +5.3V 4.0A IC Driving Voltage of Logic Board18VAMP +18V 2.0A Amp Voltage of Audio BoardVT +33V 0.006ASTD_5V +5V 1.0A Standby for Remote ControlParameter Min UnitVS(210V) 250 ~ VVA(70V) 100 ~ VD6.5V 6.8 ~ V