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  • Resolved

Problem with LM5576 - Dies on short circuit! - PCB Layout Issue

Hi, i have a problem with the LM5576 system i have put together based on a webbench design.   Attached is the circuit diagram

4532.sw_pixel_over_cat5_v3_4pin_kk.pdf

This runs, but when it a short or higher load is placed on the output, the circuit destroys itself..  A fuse on the input blows,  and the device itself is damaged, so it does'nt not work any more.

I thought that the LM5576 had short circuit protection but it does not work for me?

  • In reply to Denislav Petkov:

    Firstly i'm totally blown away by the level of support that i've had.   You've gone way past what i could have dreamed for. Thanks so much.

    I've jsut run some tests imilar to what you dod with the Cap on PCB and i get a spike that is a bit higher than yours. at about 112V.    

    We are just manufacturing PCB#2, and i hope to give it a try shortly, and i'll let you know how we go.

     

  • In reply to Andrew Frazer:

    Andrew, 

    Thank you for the positive feedback. I will pass it along to the whole SIMPLE SWITCHER apps team. We all try hard to support the field as much as possible and this sort of interaction helps us make better products and also write better datasheets and app notes. Thank YOU for using E2E. 

    Let us know how the new board works.

    Regards, 

    Denislav

  • In reply to Denislav Petkov:

    Moving the input capacitor made all the difference.  Its all working very nicely now.  

  • In reply to Andrew Frazer:

    Andrew, 

    Great! Thank you for the update. I am glad it works.

    Regards, 

    Denislav

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