Other Parts Discussed in Thread: LM3406, LM3409
HI,
I'm try to evaluate the LM3406HVEVAL board with 2 wire pwm input power supply.
I set the output current to 350mA, i connect my cob led (VF=36V).
With dc 48V the board function well
Then i connect the 2 power supply wire to the output of a pwm dimmer. the output of this dimmer in an open drain type.
When power on, the output start from 0% until 100% of pwm.
But after power on, the lm3406 burn !!!! the polary it's ok, for 2 time this happened, and i can't understand why