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SG6742: Highly integrated green-mode PWM controller

Posted: 27 Nov 2009     Print Version  Bookmark and Share

Keywords:PWM controller  SG6742 controller  flyback converter 

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

The highly integrated SG6742 series of PWM controllers provides several features to enhance the performance of flyback converters.

To minimise 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 22kHz. This green-mode function enables the power supply to meet international power conservation requirements. With the internal high-voltage start-up circuitry, the power loss due to bleeding resistors is also eliminated. To further reduce power consumption, SG6742 is manufactured using the BiCMOS process, which allows an operating current of only 2.7mA.

View the PDF document for more information.

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