Abstract: This LED-driver circuit produces a 500Hz PWM signal with 2% nonlinearity and duty cycle adjustable from 0 to 100%, using a 0V-to-5V DC control signal. Maxim > Design Support > App Notes > Amplifier and Comparator Circuits > APP 4502 Maxim > Design Support > App Notes > Display Drivers > APP 4502 Keywords: LED drivers, LED dimming, pulse-width modulation, PWM, dual comparators Aug 10, 2010 APPLICATION NOTE 4502 Single-IC PWM Modulator Has 2% Linearity By: Ahmad Ayar Abstract: This LED-driver circuit produces a 500Hz PWM signal with 2% nonlinearity and duty cycle adjustable from 0 to 100%, using a 0V-to-5V DC control signal. A similar version of this article appeared in the August 28, 2008 issue of Electronic Design magazine. Some LED-driver circuits achieve dimming by applying a variable duty cycle (PWM) to the LED……