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UCC28700 / over current protection

K.Yaita
Guru 29720 points
Other Parts Discussed in Thread: UCC28700

Hi Team,

I would like to ask about over current protection of UCC28700.
The datasheet shows the following figure.17(page.15).
What is the state of the device at the red part?
Does it come to shutdown if output current is more increased?

I would also like to know what is occured if output is shorted to GND.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Mastermind 34465 points
    In the region you refer to , the voltage on the auxiliary winding drops below the VDD turnoff threshold of the UCC28700.
    This causes the device to switch off. It will restart when the high voltage rail charges the VDD capacitor to the VDD turn on threshold.
    Thus the device enters a hiccup state of shutdown and restart.