Title :
Design considerations of time constant mismatch problem for inductor DCR current sensing method
Author :
Hua, Lei ; Luo, Shiguo
Author_Institution :
Semtech Corp., Camarillo, CA
Abstract :
This paper identifies advantages and disadvantages of several commonly used current sensing methods such as dedicated sense resistor sensing, MOSFET RDS(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
Keywords :
MOSFET; electric sensing devices; inductors; power convertors; MOSFET; RC network; buck converter; current sensing; inductor DCR; resistor sensing; signal model; time constant mismatch; Buck converters; Capacitors; Inductors; MOSFET circuits; Paramagnetic resonance; Power MOSFET; Power supplies; Resistors; Temperature sensors; Voltage;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-9547-6
DOI :
10.1109/APEC.2006.1620717
