LED drivers can be configured to dim the LEDs in two ways: pulse-width modulation (PWM) and constant current reduction (CCR). Pulse-width modulation (PWM) switches the LED current at a high frequency between 0 and the rated output current to adjust LED brightness. Constant current reduction (CCR) or analog dimming control the light output of the LEDs by adjusting the current flowing continuously to the LEDs.
No matter which lighting technology is used, the ability to effectively control the output of a light source is essential. No matter which lighting control strategy is used, dimming is, in most cases, an indispensable tool to accomplish that goal. Dimming refers to operation of adjusting the...