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TLV755P: Enable threshold.

Yee Yong Teo
Expert 4335 points
Part Number: TLV755P

Hi,

In datasheet, 0.9V is the minimum to enable and 0.4V is the maximum to disable. Questions:

  1. What is the accuracy for this threshold value?
  2. What happen to Vout if Ven falls in between 0.4V and 0.9V?
  3. Can I have the Ven vs Vout graph from 0V to 5V with Vin = 5V, Vout - 2.5V?

Thanks.

- YY

  • 0
    Guru 140200 points
    Hi Yee,

    the range between 0.4V and 0.9V is the "no go area" for the signal. :-) The EN signal should be either <0.4V or >0.9V. If the signal is between these levels, the behaviour cannot be predicted.

    This is a simple switch input. If you need a precise threshold you should add a comparator.

    Kai
  • 0 in reply to kai klaas69
    TI__Mastermind 23361 points

    Hi YY and Kai,

    When Enable voltage is between 0.4V and 0.9V, the behaviors of the devices can still be predicated. The reasons we put 0.4 as the maximum and 0.9V as the minimum is because when a voltage less than 0.4V is set on the enable pin, the part will be disabled. Same situation for the 0.9V one, when a voltage higher than 0.9 is set at enable, the device will be turned on.

    Due to the reason TLV755p has not been fully released yet, most of the characteristic curves are still not available. For the final release, a enable thresholds curves will be included in the datasheet. I have attached a enable curve that will be very close to TLS755p, please use this only for reference purpose only.

    Regards, 
    Jason Song

  • 0 in reply to Jason Song
    TI__Expert 4335 points
    Hi Jason,

    If I understand you correctly, when power up, if Ven > 0.9V, device turned on. If Ven drops below 0.9V but still above 0.4V, device will still remain on. If Ven drops below 0.4V, device will turn off. Correct?

    Thanks.

    - YY
  • 0 in reply to Yee Yong Teo
    TI__Mastermind 23361 points
    Hi YY,

    I posted the Enable thresholds curve in my previous reply. There are two lines in the curve. When enable voltage ramps beyond Enable Positive voltage, the device will be turned on; when enable drops below Enable negative voltage, the device will be turned off. From the curve, at 25C, Enable positive voltage is 700mV and Enable negative voltage is 675mV.

    Regards,
    Jason Song