Trans-conductance regulation circuit, trans-conductance error amplifier and power converter

摘要

A trans-conductance regulation circuit, a trans-conductance error amplifier module and a power converter. The trans-conductance regulation circuit provides a bias current at least partially based on an output voltage of the power converter. The bias current is sent to bias a trans-conductance operational amplifier in the trans-conductance error amplifier module so that a trans-conductance of the trans-conductance operational amplifier is direct proportional to the output voltage of the power converter. The power converter regulates the output voltage based on a negative feedback loop comprising the trans-conductance error amplifier module. The trans-conductance error amplifier module may help to maintain a band width of the negative feedback loop substantially stable and immune to variations in the output voltage.

主权项

1. A trans-conductance regulation circuit for regulating a trans-conductance of a trans-conductance operational amplifier in a power converter, wherein the power converter is configured to convert an input voltage into an output voltage, and wherein the trans-conductance operational amplifier has a bias current input terminal configured to receive a bias current, and wherein the trans-conductance is determined by a ratio of the bias current to a substantially constant thermal voltage; the trans-conductance regulation circuit comprising:
a first input terminal configured to receive the output voltage of the power converter; and a voltage to current conversion circuit configured to convert the output voltage to the bias current with a predetermined conversion factor.