Single-IC PWM Modulator Has 2% Linearity

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