With the guidance of RDR195 we designed a 20W dimmable driver with 40V/500Ma output and 230V input. It is working fine with a 230 v fan dimmers available in India. But when we run two drivers simultaneously( each driver has seperate dimmer) both driver output leds are flickering at below 260 mA region. We need to adjust the output from 500Ma to 100mA. But flicker starts at 260mA and below that leds are going flicker and off. If one driver is operatiing alone dimming is very smooth from 500mA to 100mA.
Circuit is same as rdr195 except transformer- is PQ2620. Bias voltage is 28V. What could be wrong. Kindly guide us to solve the issue.