REFERENCE SIGNAL GENERATOR AND PWM CONTROL CIRCUIT FOR LCD BACKLIGHT

摘要

PURPOSE: A PWM control circuit for the standard signal generator and a LCD back light using the same are provided to protect the apparatus by inserting a frequency buffering section in the normal start of the driving changing mode. CONSTITUTION: The standard signal generator comprises the standard signal creation part(400) generating the reference signal of the triangular waveform and the frequency buffering section in which the frequency is successively varied in the current generating part(300). An initial driving sign-off created the variable current successively varied according to the production control of the variable current by the resistance variant part(100).