A CLASS D AMPLIFIER CHIP WITH DUTY RATIO LIMITING FUNCTIONS AND THE DEVICE THEREOF

摘要

The present invention discloses a class D amplifier chip with duty ratio limiting functions and the device thereof, a class D amplifier chip includes triangle wave modules, PWM modulation modules, duty ratio detection modules and logic control modules, the input differential audio signals and triangle wave signals generated by the triangle wave module are converted into low voltage pulsed PWM signals through the PWM modulation module, then gets driving processed and generates high voltage pulses; the duty ratio detection module real-time detects the duty ratio of PWM signals, when the logic control module decides the duty ratio of the PWM signals is larger than the preset maximum value, the PWM module is controlled to stop working, equals to close the audio output of the class D amplifier device; which limits the amplitude of the output audio signals, avoids burning the speaker due to an overlarge amplitude.

主权项

1. A class D amplifier chip with duty ratio limiting functions, wherein, comprising:
a triangle wave module, configured to generate triangle wave signals, a PWM modulation module, configured to convert the input differential audio signals and the triangle wave signals generated by the said triangle wave module into low voltage pulsed PWM signals, and drive the said PWM signals to generate high voltage pulses; a duty ratio detection module, configured to real-time detect the duty ratio of the PWM signals generated by the said PWM modulation module; a logic control module, configured to control the PWM modulation module stop working while deciding the duty ratio of the PWM signals is larger than the preset maximum value.