My control theme needs the point that the negative part of inductor current is larger than 0. I have tried to use current sense resistors, but it has so large switching noise that cannot get the exact point. I have tried to use Hall current sensor with no significant switching noise, but its bandwidth is too low to sense the current with frequency of 500kHz.
Does TI have the current sensor with no switching noise and high bandwidth?Or is there any current sensing method with frequency of 500kHz?The current shape is like the figure shown below: