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     we purchased a reference design kit 195 for testing purpose and changed the flyback rm8 transformer with a EE25 TRF AS PER PIXL DESIGNER 8.6. Please find the attached design sheet. But the driver is going to auto shutdown mode with EE25 transformer. We changed feeback resistance values , but no change. The same led driver works fine with RM8 original transformer from PI. Please let us know what is the problem with EE25 cores.


LinkSwitch-PH 14w.xls43 KB

Please check first the transformer winding orientation and see if the start /end windings were swapped.