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Flyback power supply control with the SG6741

Posted: 30 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Flyback power supply control? SG6741 PWM controllers? PCB layout guidelines?

This application note describes a design strategy for a high efficiency. compact flyback converter. Design considerations, mathematical equations, and guidelines for a PCB layout are presented.

The highly integrated SG6741 series of pulse-width modulation (PWM) controllers provides several features to enhance the performance of flyback converters.

To minimize standby power consumption, a proprietary green mode 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 22kHz. This green mode 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, the SG6741 is manufactured using BiCMOS process, which allows an operating current of only 4mA.

View the PDF document for more information.

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