Zero-crossing detection circuit and method for synchronous step-down converter

摘要: In one embodiment, a zero-crossing detection circuit for synchronous step-down converter, can include: (i) state determination configured to compare drain voltage of transistor the converter against reference voltage, and generate digital signal indicative whether body diode is turned on; (ii) logic convert into counting instruction signal; (iii) plus-minus counter numerical in response (iv) DAC correction analog based on (v) comparator receive transistor, provide comparison driving converter.