Other Parts Discussed in Thread: UCC28063A,
I have a customer that is testing reference design PMP10116, which uses UCC28063A. Unfortunately it isn’t working in a stable manner when the output voltage is adjusted.
Their suspicion was that UCC28063A needs a much higher current draw at startup (like stated in the datasheet) than what the voltage divider of R11, R17 and R21 can deliver. To mitigate this they decided on using a DCDC converter instead to provide power for the device like recommend in UCC28063As datasheet.
But it is still not stable even though voltage can be adjusted in a narrow range. How can this be resolved?