DC/DC CONVERTER WITH BURST MODE USING DYNAMICALLY ADJUSTABLE PEAK CURRENT CONTROL

摘要

A DC-DC voltage converter (21,31,41) and associated control method capable of operating in pulse frequency modulation mode (PFM) and dynamically adjusting the upper boundary of the inductor current (I_L,ub) for peak current control are provided. The DC-DC voltage converter (21,31,41) is electrically connected to an input terminal (Nin) having an input voltage (Vin) and an output terminal (Nout) having an output voltage (Vout). The DC-DC voltage converter (21,31,41) converts the input voltage (Vin) to the output voltage (Vout), and the DC-DC voltage converter (21,31,41) operates in a pulse frequency modulation mode (PFM). The DC-DC voltage converter (21,31,41) includes an inductor (L) and a converting circuit (211,311,411), which are electrically connected to each other. An inductor current (I_L) flows through the inductor (L). The converting circuit (211,311,411) adjusts the inductor current (L) according to a setting signal (I_L,ub) so that the inductor current is less than or equivalent to an upper boundary of the inductor current (I_L,ub).