Title :
An area saving inductor current sensor with load transient enhancement in DC-DC converter
Author :
Hoang, Ngan K. ; Xuan-Dien Do ; Young-Jin Woo ; Sang-Gug Lee
Author_Institution :
Electr. Eng. Dept., KAIST, Daejeon, South Korea
Abstract :
Among the on-chip current sensing techniques, inductor current sensing method is the most feasible one for high switching frequency converter, which aids reduction of the filter inductor size. This paper presents a reduction of area design for the combined AC and DC inductor current sensor with load transient enhancement for the systems-on-chip applications. The proposed current sensor is simulated under several switching frequencies. Finally, the transient enhancement function of the proposed circuit is simulated in a buck converter at 4.5MHz switching frequency. When the load current changes by 500mA, by increasing time-constant delay for the sensed DC current ten times, the output voltage overshoot/undershoot reduces from 126mV/229mV to 76mV/74mV.
Keywords :
DC-DC power convertors; integrated circuit design; switching convertors; system-on-chip; AC inductor current sensor; DC inductor current sensor; DC-DC converter; area saving inductor current sensor; buck converter; high switching frequency converter; load transient enhancement; on-chip current sensing technique; systems-on-chip; Inductance; Inductors; Sensors; Simulation; Stability analysis; Switches; Transient analysis; DC-DC converter; current sensing; inductor current sensor; system-on-chip (SoC); transient enhancer;
Conference_Titel :
SoC Design Conference (ISOCC), 2014 International
DOI :
10.1109/ISOCC.2014.7087544
