Flickering at low brightness
I use the LNK408 in a LED driver and it shows subtle flickering when dimmed to low brightness. The feedback current is approx. 50-60uA to get low output power. I tried various modifications to stabilize all control currents into the chip but I it didn't change much. Even with feedback current, supply current (BP) and V-pin current drawn from a battery it's still there. At mains I tried it with an incandescent lamp parallel to the dimmed LED supply but without success. Flickering frequency is from 1-10 Hz and it's only a little modulation of the output current but you can see it and won't be accepted by the customers.
Could you please help with a potential root cause or test to identify the root cause.