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Online calibration of MOSFET on-state resistance for precise current sensing

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5 Author(s)
Zhang, Y. ; Electron. & Comput. Eng. Dept., Univ. of Colorado, Boulder, CO, USA ; Zane, R. ; Prodic, A. ; Erickson, R.
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An approach for online current sensing calibration is presented where an auxiliary switch and a precision sense resistor are connected in parallel with a main power switch to achieve accuracy comparable to the sense resistor method, together with the advantage of essentially no additional power loss. The proposed current-sensing circuit and the calibration methods are particularly well suited for digital controller implementations where the required control and calibration functions can be easily accomplished. Experimental results with a digitally controlled 1.5-V 15-A synchronous buck converter demonstrate functionality of the online calibration approach, showing a significant improvement in accuracy over voltage sensing across the power MOSFET on-resistance.

Published in:

Power Electronics Letters, IEEE  (Volume:2 ,  Issue: 3 )