Abstract: In one example, an apparatus comprises: a first transistor coupled between a power terminal and a switching terminal; a second transistor coupled between the power terminal and a first sense terminal; a third transistor coupled between the switching terminal and a ground terminal; a fourth transistor coupled between a second sense terminal and the ground terminal; a first variable current source coupled to the first sense terminal; a second variable current source coupled to the second sense terminal; a processing circuit having first, second, third, and fourth inputs and first and second outputs, the first input coupled to the switching terminal, the second input coupled to the first sense terminal, the third input coupled to the ground terminal, the fourth input coupled to the second sense terminal, the first output coupled to the first variable current source, and the second output coupled to the second variable current source.