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FAN6791/FAN6793,pdf (Highly In
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2010-10-26
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The highly integrated FAN6791/3 dual PWM
combination controller provides several features to
enhance the performance of converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease the switching frequency at light-load
conditions. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 20kHz. This
green-mode function enables the power supply to meet
international power conservation requirements. With the
internal high-voltage startup circuitry, the power loss
due to bleeding resistors is also eliminated. To further
reduce power consumption, FAN6791/3 is
manufactured using the CMOS process, which allows an operating current of only 6mA.
combination controller provides several features to
enhance the performance of converters.
To minimize standby power consumption, a proprietary
green-mode function provides off-time modulation to
linearly decrease the switching frequency at light-load
conditions. To avoid acoustic-noise problems, the
minimum PWM frequency is set above 20kHz. This
green-mode function enables the power supply to meet
international power conservation requirements. With the
internal high-voltage startup circuitry, the power loss
due to bleeding resistors is also eliminated. To further
reduce power consumption, FAN6791/3 is
manufactured using the CMOS process, which allows an operating current of only 6mA.
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