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Original question:

LM2586: Component Burnt

LM2586: LM2586S-ADJ component burn, isolated feedback

Patrik Andersson1
Prodigy 25 points
Part Number: LM2586

Hi

Ive been running into some issues getting my IC handle the different kind of load on the secondary side of the transformer, its hard to say if its been the controller loop or the compensation voltage that makes the IC burn out during start up or if its the overshoot on SWITCH-pin.

Im running at a voltage of Vin=29V and clamped earlier with a TVS of 27,6V in serie with a SMA diode but, lately i've tried with a 15V zener diode instead of TVS.

With zener ive increased margin with 12V so now im not near the 65V stand-off, that switch-pin can handle.

The design is build up using the application report http://www.tij.co.jp/jp/lit/an/snva005b/snva005b.pdf

I use all windings in the transformer WE-FLEX EFD20 and has 3 types of voltage outputs, one 5V isolated whitch I take down to 3,3V afterwards with a separate 0V groundplane and also one 5V none isolated with the same 0V groundplane as the 29V on the primary side.

Is it possible to be contacted by email to sort this out?

  • 0
    TI__Mastermind 34231 points

    Hi Patrik,

    Can you show me the schematic and layout and also tell me the load current when IC burn out?

    Have you checked the Vout, SW waveform? Is it working stable at light load condition? 

  • 0 in reply to Zack Liu
    Prodigy 25 points

    Can you open PicoScope curves?

    I would approciate if I could email you my schematics and parts of the layout design layer files in the IC area aswell as images from my oscilloskop.

    I need a closer contact since its not a hobby project. Do you have a business line?

    Ive checked the Vout, the waveform of switch, looks great and yes, its working stable at light conditions. However, there happends to appear a smal buzzing with a different waveform if I unplugg all standard loads on the primary side supply. 

  • 0 in reply to Patrik Andersson1
    TI__Mastermind 34231 points

    Hi Patrick,

    I've sent request to you as E2E friend so that you can send your files to me. I'll close this thread.