Fairchild Semiconductor primary side regulation pulse-width modulation (PWM) controllers address a critical need in the high brightness LED market by simplifying design, reducing board space, and providing performance advantages. The Fairchild Semiconductor FSEZ1016A is an EZSWITCH™ that integrates a PSR PWM controller with a power MOSFET. The Fairchild Semiconductor FAN100 is a PSR PWM controller. These primary side regulation PWM controllers achieve the most accurate constant current through their built-in proprietary TRUECURRENT™ technology and tight constant voltage without using secondary-side feedback circuitry.