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Novel adaptive pulse width modulator provides quasi-fixed switching frequency in constant on/off-time controlled regulators

This paper presents a novel adaptive pulse-width-modulator (PWM) for regulators (AC/DC or DC/DC) based on “Fixed-Off Time (FOT)” or “Costant-On-Time (COT)” control methodology, that permits to operate with quasi-fixed switching frequency in all operating conditions (e.g. CCM at full-load or DCM at medium-light load, wide input and output voltage range) and without being adversely influenced by converter's parasitic components (e.g. resistance of power switch and filter inductor). Moreover, the proposed modulator circuit is applicable to any converter topology (Boost, Buck, Flyback etc) and is based only on the power switch gate driver logic signal (GD), saving the IC's pin count and/or complexity.