> > Many switching supplies have VERY tricky startup circuits that tickle the > controller to start and then power the controller from an auxiliary winding on > the transformer. Some of these circuits might require some capacitor to fully > drain before they can start properly again. Some of these circuits may have a > really high resistance value that charges the controller's supply cap, and > then > a transistor turns off that path when the controller is running to avoid > overheating that resistor. These circuits will be at mains potential so be > careful when testing them. >
Thanks Jon. In my case even when the outputs are at 0V, I can see the that the output transformer is producing outputs, if that is true would that confirm that startup is not the issue here? Thanks Rob
