Abstract
Inductors with ultra-low DC resistance (DCR) are preferred in DC-DC converters due to low power loss and high efficiency. Previous lossless DCR current sensing method suffers from bad current readback accuracy for ulta-low DCR inductors, due to leakage pin current of the controller. This paper proposes a novel accurate current sensing scheme to improve the current readback accuracy. Only one resistor and one capacitor are added into previous DCR current sensing scheme to balance the leakage pin current and improve noise immunity performance. The proposed scheme is low cost, and very simple for implementation. The experimental results verify the effectiveness of the proposed current sensing scheme. With the proposed current sensing scheme, +-3% current readback accuracy can be achieved in industry power uModule products [1] [2].
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