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Design and application guide for SG6859A

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

Keywords:flyback converter? SG6859A? PWM controller?

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

This highly integrated pulse-width modulation (PWM) controller provides several special enhancements designed to meet the low standby- power needs of low-power switch-mode power supply (SMPS). To minimize standby power consumption, the proprietary green-mode function provides off-time modulation to linearly decrease the switching frequency under light-load conditions. This green-mode function enables the power supply to easily meet even the strictest power conservation requirements.

To protect the external power MOSFET from being damaged by excessive supply voltage, the output driver is clamped at 17V. SG6859A controllers can improve the performance and reduce the production cost of power supplies and provide a choice for replacing linear and RCC-mode power adapters. SG6859A is available in 8-pin DIP and 6-pin SOT-26 packages.

View the PDF document for more information.

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