I'm looking at the datasheet and app note for a Linkswitch-PL flyback LED driver. It states a few times that the threshold voltage on its feedback pin (for constant current operation) is around 290mV.
However, this threshold value changes when the LED is dimmed with a TRIAC dimmer (I plan to use the leading-edge variety).
It is my understanding that the Linkswitch senses zero crossings when the DC voltage on its drain pin falls below 19V- but how does this tie into the current sense threshold? Is there some guideline available that relates conduction angle at TRIAC turn-on to the Linkswitch IC's current-sense threshold?