FAIRCHILD SEMICONDUCTOR FSGM0565R FPS power switch for off-line power supplies up to 60 Watts (for universal ac input) achieves exceptional standby power consumption in a 66kHz flyback converter: 120mW at 265Vac in with 25mW of load. This is enabled by the SenseFET, a high-voltage startup circuit that turns off the startup resistor, and soft burst operation in standby, saving 30mW and preventing the converter from generating audible noise.
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