CURRENT SAMPLING CIRCUIT APPLIED TO A MULTI-MODE CIRCUIT AND ASSOCIATED CONTROL METHOD

摘要

A multi-mode circuit has a first switch, a second switch, a third switch and a fourth switch. A current sampling circuit applied to the buck-boost has a first sampling circuit, a second sampling circuit and a current processing circuit. The first sampling circuit generates a first sampling current by sampling the current flowing through the first switch, the second sampling circuit generates a second sampling current by sampling the current flowing through the second switch, and the current processing circuit generates a third sampling current based on the first sampling current and the second sampling current. An average value of the third sampling current of one cycle represents the output current of the multi-mode circuit.