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LTC3871 frequency and phase problems

Question asked by qianliang on Aug 2, 2018

The LTC3871 output of the two PWM wave phase is not 180 degrees, and the frequency varies. VFREQ=0.6V, but the output frequency is only about 25K. Only after entering the feedback loop will it become 76k, but the phase is still not fixed at 180 degrees, which is changing.