i have the following schematic for 50hz 12v to 220v dc. i have foud it from internet but not yet tested it. The problem is that how i can adjust pin no.2 the duty cycle by giving feed back from output 220 to obtain pwm? does it only require modification on the pin 2 or whole circuit needs to be changed?
A feedback amplifier and compensation circuit involving pins 1,2 and 9 should be supplemented. The 230 VAC output needs to be rectified for the feedback.
I don't have a schematic, but the feedback circuit of your example can basically work. The feedback amplifier should probably have a PI rather than a pure I characteristic for faster response.
Hi,you can simply used step down transformer let's say 6-9volt from your final output and rectified it,use simple pot and control pin 1 of your SG3525.