Voltage converter controller and voltage converter circuit

摘要

A voltage converter controller and a voltage converter circuit, either of which includes a voltage-drop compensating circuit for compensating a voltage drop between an output voltage and a load. The voltage-drop compensating circuit includes a trans-conductance stage and a squarer. The trans-conductance stage outputs a compensating sink current to a voltage dividing terminal of the output voltage and outputs a compensating source current to a reference voltage terminal of an error amplifier. An input terminal of the squarer is coupled to an output terminal of the error amplifier. An output terminal of the squarer is coupled to an input terminal of the trans-conductance stage.

主权项

1. A voltage converter controller, adapted to a voltage converter circuit which operates a power switch of the voltage converter circuit to convert an input voltage on a converting input terminal to an output voltage on a converting output terminal through a transformer, the converting output terminal providing a load current to a load by electric connection through a conducting line, the transformer including primary windings and secondary windings connected to the converting input terminal and the converting output terminal respectively, when a channel of the power switch conducted, the primary windings coupled to a ground terminal through the channel of the power switch, the voltage converter controller comprising:
a pulse-width-modulation clock, having a modulating period and controlling the conduction of the channel of the power switch; a comparator, including a first comparing input terminal, a second comparing input terminal, and an output terminal, wherein the output terminal of the comparator outputs a control signal corresponding to a comparing result of the comparator, the control signal controls a cut-off of the channel of the power switch, the first comparing input terminal receives a signal representative of a current quantity of the channel of the power switch, and the second comparing input terminal receives an error signal; an error amplifier, including a reference input terminal, a feedback input terminal, and an error output terminal, wherein the error output terminal outputs the error signal, the reference input terminal receives a reference voltage, and the feedback input terminal couples to the converting output terminal; and a voltage-drop compensating circuit, including a transconductance stage and a squarer, wherein the transconductance stage outputs a compensating sink current to the feedback input terminal or outputs a compensating source current to the reference input terminal, an input terminal of the squarer is coupled to the error output terminal, and an output terminal of the squarer is coupled to an input terminal of the transconductance stage, wherein the squarer is realized by a multiplier, the error signal on the error output terminal is squared and passed into the transconductance stage via the squarer.