Abstract
This paper identifies advantages and disadvantages of several commonly used current sensing methods such as dedicated sense resistor sensing, MOSFET R/sub DS(ON)/ current sensing, and inductor DC resistance (DCR) current sensing. Among these current sense methods, inductor DCR current sense will become dominant one in the future. The mismatching issue between the time constant made by the current sensing RC network and the one formed with output inductor and its DC resistance is addressed. A small signal model of a buck converter using inductor DCR current sensing with mismatched time constants is presented, and the modeling has been verified experimentally.
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