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TPS7A85A: About the test condition with Bias voltage

T Kishi
Genius 4425 points
Part Number: TPS7A85A

Hi

There is thing I want to check.

Regarding the drop voltage specification of TPS7A85A [Electrical Characteristics], the test condition with Vbias is Vias = 5.0V.
Figure 26 shows a graph. It is Vbias = 3.3V.
Is this just a different test condition?
Also, is it correct that there is no significant change in the graph in Figure 26 at Vbias = 3.3V or 5.0V?

Regard

T Kishi

  • 0
    TI__Mastermind 23361 points

    Hi Kishi-san,

    You are right, due to the design of this device, the dropout curves as shown in Figure 26 will pretty much stay the same for Vbias = 3.3V and 5V.

    Regards,
    Jason Song

  • 0 in reply to Jason Song
    Genius 4425 points

    Hi jason

    Thank you for reply.

    Ask another question for the same purpose.

    Figure 23 24 shows a graph of Drop voltage versus input voltage (with and without bias)
    Is the condition when you get this graph Vin = Vout?

    Regard

    T Kishi

  • 0 in reply to T Kishi
    TI__Mastermind 23361 points

    Hi Kishi-san,

    Figure 23 and 24 do not specify the Vout conditions with the plots. For this kind of plots, normally the FB pin is shorting to ground to have the pass-FET on and a 4A current was forced to be sinked from the output. At the same, the voltage on the output has been recorded.

    Here the output voltage is measured and the difference between Vin and Vout is the dropout recorded in the plots.

    Does it make sense?

    Regards,
    Jason Song