Abstract
Inductor DC resistance (DCR) measurement is the standard technique used to measure the current in a single- or multi-phase voltage regulators in computing applications. It is well noted that variations in operating conditions such as temperature cause a mismatch of time constants of the inductor and its DCR, and the RC sensing network. This mismatch affects everything from transient response to safety by affecting the performance of peak current protection features. A digital filter with temperature-adaptive coefficients is presented to correct the DCR measurement across the operating temperature range. Experimental results of a 12 V/1.8 V converter validate the analysis and prove the feasibility of the approach.
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