Ive been trying to get a step-up for my LiPo's that can boost to high voltages (>15V) with high current as well (around 2A). I found and tried this one based around the mt3608, but it does not deliver close to 2A as promised. Instead it starts giving off a buzz and limits the current around 1A when connected to a 10 Ohm load at 18 V. Why is this, and what alternatives should be considered for step-ups in this range? Sorry if this is a noob question, quite new to electronics.