For a peak current control mode BUCK, when duty cycle is over 50%, subharmonic oscillation occurs. Then slope compensation applies. The most ideal case is the slope compensation ramp is equal to inductor current down-slope, which will lead perturbed current back to original value in one switching cycle. But in practice, it's hard to make them perfect equal since inductor value may slight change. Through my calculation, a narrow and wide SW pwm waveform occurs when slope compensation ramp is much than inductor current down-slope. But in real test, a narrow and wide SW pwm is not always seen with higher inductor value(with much slope compensation). Hope someone has this th0uogt before, and can answer my question.
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