Adaptive startup control for boost converter

摘要

This document discusses apparatus and methods for a boost converter start-up circuit. In an example, a start-up circuit can include a linear current generator configured to couple a supply terminal of the voltage converter to an output terminal of the voltage converter. The linear current generator can include a modified current mirror and a feedback circuit configured to provide a first representative of an output voltage of the output terminal to an input of each of a first and a second adjustable current source of the modified current mirror.

主权项

1. A start-up circuit for a voltage converter, the start-up circuit comprising:
a linear current generator configured to couple a supply terminal of the voltage converter to an output terminal of the voltage converter, the linear current generator comprising:
a modified current mirror, including:
a first adjustable current source; anda second adjustable current source; anda feedback circuit configured to provide a first representation of an output voltage of the output terminal to an input of each of the first and second adjustable current sources;wherein the modified current mirror includes:
a first sense transistor coupled to the supply terminal;a first mirror transistor having a gate coupled to a gate of the first sense transistor, the first mirror transistor coupled to the supply terminal and the output terminal;a second sense transistor coupled in series with the first mirror transistor and the second adjustable current source, and coupled to the output terminal; anda second mirror transistor having a gate coupled to a gate of the second sense transistor, the second mirror transistor coupled in series with the first sense transistor, wherein the gate of the first sense transistor is coupled to a drain of the second mirror transistor and the first adjustable current source.