I designed 60W 1.4A CC Led Driver according to attached PIXLS and schematic.
The problem is driver works normally just between 230-290VAC. Below the 230VAC, IC is loosing CC control.
I tried all the combination like changing Fb resistor, Bypass resistor and Filter resistor (R14), Bypass Capacitor (47uF and 4u7) without exceeding
190uA. All these effected just a few volts for the AC input.
Also I tried different Voltage sense resistors (higher and lower). It changed significantly. But this time
AC working area shifted like 180-230VAC.
What can be tried else?