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FAN6791/FAN6793,pdf (Highly In

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  • 标      签: PWM

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The highly integrated FAN6791/3 dual PWMcombinaTIon controller provides several features toenhance the performance of converters.To minimize standby power consumpTIon, a proprietarygreen-mode funcTIon provides off-TIme modulation tolinearly decrease the switching frequency at light-loadconditions. To avoid acoustic-noise problems, theminimum PWM frequency is set above 20kHz. Thisgreen-mode function enables the power supply to meetinternational power conservation requirements. With theinternal high-voltage startup circuitry, the power lossdue to bleeding resistors is also eliminated. To furtherreduce power consumption, FAN6791/3 ismanufactured using the CMOS process, which allows an operating current of only 6mA.
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