This application note describes a detailed design strategy for a high-efficiency, compact flyback converter. Design considerations, mathematical equations, and guidelines for a Printed-Circuit-Board (PCB) layout are presented.
The document provides an in-depth guide on designing with the SG6742 series of PWM controllers. It highlights key features such as green-mode operation to reduce standby power, peak-current-mode control, and various protection mechanisms like open-loop protection and over-temperature shutdown.
Key sections cover internal block operations including startup circuitry, soft-start functionality, under-voltage lockout (UVLO) specifications, feedback input configuration, and the built-in synchronized slope compensation required for stable continuous-conduction mode operation.
The device has a low operating current of 2.7mA.
It utilizes an internal open-loop protection circuit to ensure safety during these failure conditions.
The SG6742 features a Gate Output Maximum Voltage Clamp of 18V.