We developed SMPS using L6566b reference from ST power supply tool.
Designed for 90-450Ac to 12vdc/2Amps.
We observed that get output voltage of 11.73Vdc load of 8 ohm but no load condition get 11.90Volts.
Above reading from on multi-meter.
We seen wave form of out put voltage it's getting in pulses, So what could be issue in circuit.