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TPS54561: use bias voltage on boot pin

Intellectual 1160 points

Replies: 5

Views: 72

Part Number: TPS54561

Hi Team,

just want to check with you if adding a 5.4V bias voltage on Boot pin through a diode is OK for normal operation or not. 

The 5.4V power up before Vin and shut down before Vin.  Thanks. 

BRs

Given

  • Hi,

    I think that should be ok, but just be aware of the maximum boot voltage limit for the pin

    I can see that there is an app note similar to what you are trying to do

    http://www.ti.com/lit/an/slva547a/slva547a.pdf

    I would say that you should power the 5.4V up after you power the VIN

    Thanks

    -Arief

  • In reply to Arief Hernadi:

    Hi Arief,

    Thanks for your reply. 

    one more question, why does the 5.4V up after Vin? It seems no difference from my perspective. Thanks. 

    BRs

    Given

  • In reply to Given Ding:

    Hi Arief,

    Any feedback? Thanks.

    BRs

    Given

  • In reply to Given Ding:

    Hi Given,

    For me it is just a precaution so that the external bias does not interfere with normal startup sequence of the IC. 

    Thanks

    -Arief

  • In reply to Arief Hernadi:

    I believe Arief was able to help you out here.

    Let us know if this design requires more help.

     

    Marshall Beck
    Texas Instruments, Power Applications 

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