PWM signal generating circuit for DC-DC converter using dimming signal and LED driving circuit having the same in direct digital dimming method
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United States of America Patent
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Mar 14, 2017
Grant Date -
May 10, 2012
app pub date -
Oct 31, 2011
filing date -
Nov 10, 2010
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Abstract
An LED driving circuit is provided. The LED driving circuit includes an input unit which receives an input dimming signal for driving an LED array, a PWM signal generating unit which extends an on-period of the input dimming signal to form an extended dimming signal, and generates a PWM signal using the extended dimming signal, a DC-DC converter which supplies output voltage to the LED array using the PWM signal, and an LED driving unit which drives the LED array using the input dimming signal.
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