Hey guys.
Im designing a constant current LED driver with brightness control with pwm.
I want to use lm3414.In the datasheet it has been said that if i put a 7k resistor at the iadj pin the led max current will be limmited to about 400ma.But when i increase the pwm duty after the current reached 400 ma it wont get higher but when the pwm is rising the IC explodes and the output will connect to ground and the LEDs damage because of this. I have raised the inductor to 100 uh but the same problem appeared.
What is the problem?
I tried with 2 series 3 watt leds and with one 30 watt leds.
Im designing a constant current LED driver with brightness control with pwm.
I want to use lm3414.In the datasheet it has been said that if i put a 7k resistor at the iadj pin the led max current will be limmited to about 400ma.But when i increase the pwm duty after the current reached 400 ma it wont get higher but when the pwm is rising the IC explodes and the output will connect to ground and the LEDs damage because of this. I have raised the inductor to 100 uh but the same problem appeared.
What is the problem?
I tried with 2 series 3 watt leds and with one 30 watt leds.