SINGLE INDUCTOR MULTIPLE OUTPUT BOOST CONVERTER USING CURRENT CONTROL SCHEME

摘要

The present invention relates to a single-input multiple-output boost converter using a current control technique, which includes a feedback control circuit which increases and decreases the variation of a bias current which is charged in and discharged from a charging capacitor through bias switching by sensing a zero current according to the variation of a load current, and a PWM generator which controls a PWM duty ratio by comparing a reference voltage with a voltage outputted from the feedback control circuit. The total area of a chip and chip costs are reduced by not requiring an additional RC compensation circuit and an error amplifier. Also, a fast response speed according to the variation of the load current is obtained. Finally, the stability of a circuit is improved. [Reference numerals] (2) Load; (3) Clock generator; (4) Feedback control circuit; (41) Zero current sensor; (42) Current tracking circuit; (5) Comparator; (6) PWM generator; (AA) S_UP pulse; (BB) S_DOWN pulse