High Accuracy CMOS Current SensingCircuit forCurrent Mode Control Buck Converter
Yuang‐Shung Lee · 2007
A current modecontrol (CMC)integrated circuit (IC)withaccuracy current sensing circuit (CSC) forbuckconverter ispresented inthispaper. Withthe proposed accurate integrated current sensor, thesensed inductor current, combined withtheinternal rampsignal, canbeusedforcurrent modeDC-DCconverter feedback control. Theproposed CSC doesnotneedanoperational amplifier toimplement, andhasbeenfabricated witha standard 0.35 , m CMOS process. Simulation results show thattheswitching converter canbeoperated upto1MHz. Whichissuitable forsignal cell lithium-ion battery supply applications, thepowerefficiency isover85% forsupply voltage from2.5Vto5Vandtheoutput current is200mA. The performance oftheproposed circuit isthegood compared totheother circuits.