Well, that's kind of the point of the check. Except in the most extraordinary conditions, the voltage will drop as you approach the supply's current limit. It

Well, that's kind of the point of the check. Except in the most extraordinary conditions, the voltage will drop as you approach the supply's current limit. It takes significant effort to design a circuit that can sustain large amounts of current while keeping voltage constant. There's basically no overlap between that sort of design and cheap Chinese fire hazards.