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UC2845A: UCC2845A's UVLO

Masaharu Takahashi
Expert 4170 points
Part Number: UC2845A

Hi, team.

what "Start threshld" and "minimum operation voltage after turnon" mean and its different ?

how do we use 2 below different parameters ?

is there any reason why there are 2 different voltage?

  • 0
    TI__Mastermind 34465 points
    Hello Masaharu,
    As the input bias supply voltage supply (Vcc) is increased the start threshold is the voltage that the ic starts operating at.
    This is normally called Vcc(on) or UVLO(on)
    If you decrease the input voltage from the Vcc(on) value, the ic will eventually turn off.
    This is referred to as the "minimum operation voltage after turnon".
    It is also called Vcc(off) or UVLO(off)

    Regards
    John
  • 0 in reply to John Griffin1
    TI__Expert 4170 points
    why are there 2 different voltage overlapped ?

    ・Start theresholdUVLO turn on: 7.8V ~ 9V
    ・Minimum UVLO turn off : 7V ~ 8.2V

    "UVLO ON 7.8v" is covered in 8.2V (UVLO turn off).
    what is this meaning ?
  • 0 in reply to Masaharu Takahashi
    TI__Mastermind 34465 points

    I am listing the UVLO(on) value with the corresponding UVLO(off) in brackets ( ) below for the UC2845A

    These value were taken from the table in your first post :

    7.8 ( 7 )

    8.4 (7.6 )

    9 ( 8.2 )

    There is 0.8V of a difference between each of these values.

    So for example if a device turns on at 9V it will turn off at 8.2V

    There is no overlap.

    Regards

    John