Hi Team,
We are using "UCC28710" in our design for flyback control of the transformer.We have powered up the board but we are not getting any output voltage.I have checked the HV pin of the controller if we are getting the initial start up voltage and we are getting 219V ,but the feedback voltage measured is only 8V.As per the datasheet the startup threshold voltage is 21V. Please let us know what are all the reasons that the controller goes in to low threshold voltage and does not start the mosfet switching operation?
We have verified all the components associated with the controller and all are in working condition.