I allready desing a driver with LNK410, using PI Expert, I did it with all compenents described, and then, I had output only 5v, I check double twice, I did not find nothing wrong, I take out all diodes to check them and I forgot to solder a blocking diode (fr257), the driver stars prety nice, led string of 75w get full light, but now I can not dimmer without flashing and buzz noise.
question, what is happen? if I put the fr257 this make output drops, and star uneven reading at all.
in ther way I take out the fr257 and star ok, but with out dimmeraizing.
can you help me to fix it? , schematic included