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Type: Conference paper
Title: On-chip current sensing circuit for current-limited minimum off-time PFM boost converter
Author: Kim, Y.S.
No, B.M.
Min, J.S.
Al-Sarawi, S.
Abbott, D.
Citation: Proceedings of the International SoC Design Conference (ISOCC) 2009: pp.544-547
Publisher: IEEE
Publisher Place: USA
Issue Date: 2009
ISBN: 9781424450350
Conference Name: ISOCC (2009 : Korea)
Statement of
Yeong-Seuk Kim, Bo-Mi No, Jun-Sik Min, Said Al-Sarawi and Derek Abbott
Abstract: An on-chip current sensing circuit for current-limited minimum off-time pulse frequency modulation (PFM) boost converter is designed and verified by SPICE simulations. The current mirror pair, power and sensing MOSFETs with size ratio of K, is used in our on-chip current sensing circuit. Very low drain voltages of the current mirror pair should be matched to give accurate current sensing, so a folded-cascode opamp with a PMOS input pair is used in our design. Simulation results show that current sensing is accurate with properly frequency compensated opamp; over-compensation results in inaccuracies in current sensing.
Rights: ©2009 IEEE
RMID: 0020097802
DOI: 10.1109/SOCDC.2009.5423823
Appears in Collections:Electrical and Electronic Engineering publications

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