DRIVING CIRCUIT, VOLTAGE CONVERTER HAVING ADAPTIVE DEAD TIME CONTROL FUNCTION AND METHOD OF CONTROLLING DEAD TIME

摘要

A voltage converter includes a switching driver, a controller, a low-pass filter and a pulse width modulation signal generator. The switching driver includes a pull-up switching circuit connecting an input voltage to a switching node in response to a pull-up signal and a pull-down switching circuit connecting a ground voltage to the switching node in response to a pull-down signal. The controller generates the pull-up signal and the pull-down signal in response to a pulse width modulation signal and measures pull-up and pull-down turn-on times of the pull-up and pull-down switching circuits in real time to control a dead time. The low-pass filter filters a switching voltage signal on the switching node to generate an output voltage. The pulse width modulation signal generator generates the pulse width modulation signal based on a reference signal and the output voltage.

主权项

1. A voltage converter comprising:
a switching driver including a pull-up switching circuit and a pull-down switching circuit, the pull-up switching circuit being configured to connect an input voltage to a switching node in response to a pull-up signal, the pull-down switching circuit being configured to connect a ground voltage to the switching node in response to a pull-down signal; a controller configured to generate the pull-up signal and the pull-down signal in response to a pulse width modulation signal and configured to measure a pull-up turn-on time of the pull-up switching circuit and a pull-down turn-on time of the pull-down switching circuit to control a dead time, the dead time being a time during which both of the pull-up switching circuit and the pull-down switching circuit are turned off; a low-pass filter configured to filter a switching voltage signal on the switching node to generate an output voltage; and a pulse width modulation signal generator configured to generate the pulse width modulation signal based on a reference signal and the output voltage.