Folks,
Got an LTC6992 in the -3 version which goes from 0% to 95% duty cycle, controlling a fairly massive PWM stage. It lives inside a (stable) PID loop and works ok except at very low duty cycles under 2%. There is breaks into a jitter and because I am driving big capacitive loads that results in tons of wasted power. Also, it quite abruptly turns off at a fraction of a percent instead of gracefully going towards 0%.
I've babied the device quite well and all the signals look clean, including on the very sensitive SET pin. In case stuff gets into the die I have tried shielding the whole stage and even that changed nothing.
Anyone had that happen and knows a fix?