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TPS715A: About Output noise density

Kaji@PAN
Mastermind 7280 points
Part Number: TPS715A

Hi,

I am considering using the TPS715A device.
I would like to ask you about the Output noise density.

The data sheet has the output noise data shown in the figure below.
How much variability should this data be expected?
Could you give me information on how much the noise output by the regulator fluctuates from the TYP value?
Information as a guide is sufficient. There is no need to guarantee the value.

Also, in the figure below, the noise differs depending on the current value. Is this a general situation? Or is it unique to this device?

Best regards,

  • 0
    TI__Mastermind 45325 points

    Hello,

    Kaji@PAN said:
    How much variability should this data be expected?

    When doing the validation we only test a few parts to generate the noise figures because the noise density generally doesn't vary much between parts. 

    Kaji@PAN said:
    Could you give me information on how much the noise output by the regulator fluctuates from the TYP value?

    This is not a low-noise part, so we do not guarantee a maximum noise level, and it is difficult to say without measuring more parts. 

    Kaji@PAN said:
    Also, in the figure below, the noise differs depending on the current value. Is this a general situation? Or is it unique to this device?

    The output noise of LDOs generally does change with output current. However, most of the noise generated by an LDO originates in the bandgap reference and is gained up by the feedback network, so the selection of output voltage is a larger influencer on output noise level than output current is. 

    Best regards,

    Nick