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Understand quasi-resonant, resonant converters

Posted: 21 Jan 2009     Print Version  Bookmark and Share

Keywords:Quasi-resonant  converters  MOSFET 

Quasi-resonant flyback and LLC resonant converters are increasingly used in embedded AC-input power supplies. The practical range of operation for a quasi-resonant converter runs from a few watts to about 100 watts. Full-load efficiency ranges from around 81 per cent for a 7-watt, 12-volt supply for an integrated solution, to greater than 88 per cent for a 70-watt, 22-volt supply using a quasi-resonant controller with an external MOSFET. The low-power example has a standby consumption well below 150 mW; the higher power example has a standby power of less than 350 mW. Using lower output voltages will reduce the efficiency below this level quickly. A 5-watt, 5-volt power supply will waste at least 10 per cent of the rated output power in the output diode.

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