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Definition of "current-mode control" |
the inductor current is sensed to control the pulse width. The switch is turned on by a constant frequency clock and turned off when the inductor current reaches the control reference. This method produces subharmonic oscillations if the steady-state duty ratio is greater than or equal to 0.5. An artificial stabilizing ramp is necessary to achieve stable control over the full range of duty ratios. When the slope of the ramp is equal to the falling slope of the inductor current, one cycle response is achieved. (i.e., the input perturbations are rejected, and the current reference is followed within one cycle). |
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