Advantage and disadvantage of led constant current IC

In currently, the led constant current ic is performed in series high frequency pulse(PWM) to LED.

PWM control technology is the most popular technology in constant current IC. the human’ eyes can’t feel flicker-free(the factory always say: LED work in pure DC and flicker-free, eliminating the visual fatigue by traditional strobe light) , the reason is that PWM frequency is so high. the design full coincidence of Ergonomics ,and it can save power energy.

But the work frequency of constant current ic in 100KHz~500KHz, so the IC suitable only for small power LED.