Start up circuit for a boost mode controller

摘要

A boost mode controller with start up circuit includes: an inductor 12; a transistor 10 coupled to a first end of the inductor 12; a diode 16 having an anode coupled to the first end of the inductor 12; a capacitor 14 coupled to a cathode of the diode 16; a logic circuit 22 having an output coupled to a control node of the transistor 10; a comparator 28 having an output coupled to a first input of the logic circuit 22, a first input of the comparator 28 coupled to the capacitor 14, and a second input of the comparator 28 coupled to a reference node; and a counter 20 having an active low reset coupled to the output of the comparator 28 and an output coupled to a second input of the logic circuit 22.