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Varying sensing current in current mode control DC/DC

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hoonsk

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Anyone can comment about the effects of the variation of the inductor sensing current in current mode control in buck or boost converter. The variation can be due to the sensing element (e.g. resistor) variation. Appreciate any link or documents to support.
One observation I see is too much variation could affect the min or max output current.
Thanks.
 

Miguel Gaspar

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For a variation of the resistor only if it is of carbon deposit o carbon film. If the one you used is metal film or wire wound there is no variation.
Usually in design you must calculate the Lmin and Lmax of the inductor and use a intermediate value. If you used a smaller or greater problems will ocour.

Switch-mode Power Supply Spice Cookbook, Christophe P. Basso, McGraw-Hill

Simplified Design os Switching Power Supplies, John D. LEnk, Butterworth-Heinemann
 

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