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Original question:

LM5026: Strange UVLO behavior

LM5026: Pls hlep to review the sch

Gabriel Wang1
Genius 4725 points
Part Number: LM5026

Dear Expert

Could u hlep to review the sch ,many thanks !

Could u hleo tell me after lowering the two legs, the SS will also discharge internally, right ？

  • 0
    TI__Guru 74115 points

    Hi,

    I will review the schematics and usually such a review needs a bout a week when I will reply to you.

    I am not understand your question - what do you mean lowering the two legs? It is better you just indicate which circuit to be controlled like what and what is possible expectation 

  • 0 in reply to Hong Huang
    Genius 4725 points

    Dear Hong 

    Sorry to translate incorrect .

    It's means 2PIN put low lever SS pin could be discharge internally .

    Any sch review update will be really greatfull .

  • 0 in reply to Gabriel Wang1
    TI__Guru 74115 points

    Hi,

    Thanks for the update!

    I will review the schematics when comes to this one.

  • 0 in reply to Hong Huang
    TI__Guru 74115 points

    Hi,

    Do you mean when pin 2 is low, SS will be discharged internally? If so, yes.

    On you schematics:

    - suggest remove C89, a typical application COMP does not have such a capacitor.

    - Q3 and Q5 do not need R-C snubber (C38, C47, etc) - these can make the performance worse

    - The diode in series connected to R64 should be bypassed - where did you see such a diode use?  

    - U9, pin 6, where is 15VP from?

    - Add R-C in parallel with R61 as place holder in case needed

    - What is D24 associated circuit function?