Abstract
As an important method of pulse frequency modulation (PFM), constangt off-time (COFT) is widely used in switching power. However, the switching frequency changes with the input and output voltage, which increases the power consumption of the switching power and is prone to high electromagnetic interference (EMI). Therefore, a new fixed frequency COFT control method (F-COFT) is designed. By designing a charging timing circuit that carries input and output voltage information, the input and output voltage information is fed back to the timing module to realize dynamic adjustment of the constant-off time to ensure the stability of the frequency and eliminate the influence of frequency changes on the circuit. Through LTSPICE simulation, the feasibility of the scheme is verified.
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