How to Generate a 20MHz Tunable PWM Switching Frequency for SEPIC Converter Design

The discussion addresses the challenge of generating a tunable 20 MHz PWM switching frequency for a SEPIC converter design. It is noted that 20 MHz is an unusually high and generally impractical switching frequency for SEPIC converters, where typical frequencies are around 200 kHz. For generating such high-frequency PWM signals, suggestions include using programmable logic devices such as CPLDs or FPGAs. Another proposed method is employing a crystal oscillator in a Pierce oscillator configuration to achieve stable high-frequency oscillation. Additionally, it is emphasized that SEPIC converters require feedback-controlled duty cycle modulation to maintain proper regulation. A reference to a Texas Instruments application note (slyt309.pdf) is provided for further technical guidance.
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