We have a custom designed led driver using LM3406. The schematic is following the schematic of design example 1 in the datasheet. We use arduino to generate PWM to control the dim pin. But we get strange results. According to datasheet when dim pin gets low level, the leds should be off. And leds is on when dim pin gets high.
Actually we get completely opposite result. We want to know if anyone in the forum has same issue so that can provide us some hints.
Best Regards,
Bo