The standard signal generator and the resistant variable section which offers

摘要

PROBLEM TO BE SOLVED: To provide a reference signal generator and PWM control circuit for LCD backlight, protecting internal elements by preventing a peaking phenomenon that may occur when frequency abruptly changes.;SOLUTION: The reference signal generator includes: a resistance varying unit 100 that provides variable resistance that gradually changes in accordance with a load control signal SLC; a current control unit 200 that controls generation of a variable current gradually changing in accordance with the variable resistance of the resistance varying unit 100; a current generating unit 300 that generates the variable current gradually changing; and a reference signal generating unit 400 that controls charging until a charged voltage charged by the variable current reaches a first reference voltage Vref1, starts discharging when the charged voltage reaches the first reference voltage Vref1, controls discharging until the charged voltage reaches a second reference voltage Vref2, and generates a triangular wave reference signal that has a frequency buffering interval in which a frequency gradually changes when an initial driving completion signal or a protection signal is input.;COPYRIGHT: (C)2011,JPO&INPIT