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AN1729 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN1729 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 10 page 1/10 AN1729 APPLICATION NOTE June 2003 QR ZVS Flyback topology In figure 1 a typical Flyback topology is illustrated. CD is the total capacitance of the drain node. It is the sum of the Mosfet' s COSS, transformer intrawinding capacitance, stray capacitance due to the layout of the circuit as well as other contributions reflected from the secondary side. Figure 1. Flyback topology Llk Lm Ls Lp Cin Rp Vin Vout Cd VDS D03IN1462 by: R.D. Stracquadaini, C. Leonardi L6565-BASED LOW COST SMPS FOR TV WITH LESS THEN 1W STANDBY CONSUMPTION The need for energy consumption reduction brings to the design of more and more efficient power sup- plies. High efficiency is required not only when the system supplied is fully operating but also when it is in standby condition and absorbs very little power. A common design target for many home appliances is that their power consumption in standby mode be less than 1W. In this paper a cost-effective solution for the power supply of a 60W 14" TV, with a standby power con- sumption of less then 1W is presented. The topology used for this Switch Mode Power Supply is a Quasi-resonant Flyback Converter (See AN1326) in order to reduce the switching losses (ZVS at turn-on) and then to increase efficiency. In or- der to increase the performance in standby condition the start up network was designed with particular care and the 2nd level of overcurrent protection of the L6565 QR controller is used to obtain an enhanced burst mode operation of the power supply when the system is in standby condition. The power MOS STP7NK80 (BVDSS = 800V, RDSon = 1.5Ω ) is used as the power switch. |
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