Hello,
i designed a pcb based on AN-1953 LM3409HV evaluation board.
The max current is 2A at 40V for string led (10 leds).
I have 2 problem :
1) i heard "noise" on the inductor on my pcb when i put pwm signal on enable pin on the LM3409HV (same noise on evaluation board)...at 2 khz. If i change pwm frequency i have noise too at 3khz, 4khz etc...
i tried to change inductor with differents brands but it doesn't solve the problem.
2) when i use Iadj for analog dimming i can not turn off the light even putting 0V is it normal? i need to use enable pin for switch off the light?
Someone can help me please?
