An area saving inductor current sensor with load transient enhancement in DC-DC converter

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...

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Bibliographic Details
Published in2014 International SoC Design Conference (ISOCC) pp. 3 - 4
Main Authors Hoang, Ngan K., Xuan-Dien Do, Young-Jin Woo, Sang-Gug Lee
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2014
Subjects
current sensing
DC-DC converter
Inductance
inductor current sensor
Inductors
Sensors
Simulation
Stability analysis
Switches
system-on-chip (SoC)
Transient analysis
transient enhancer
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Summary: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.
DOI:10.1109/ISOCC.2014.7087544