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Type: Posts; User: Winsu

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  1. Closed: How to get the operating temperature ( case temperature)

    Hi All,

    I have come across with this regulator and it just specifies the max thermal junction. I can just get temperature from the case, how could I calculate the max temperature possible on the...
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    Closed: Improve thermal path on 8-Lead Plastic

    Hi All,

    I am trying to improve the thermal path for the DFN-8 package and I wonder what kind of options do I have?. Can I just moves tracks around and and fill the area with copper, Could I put...
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    Closed: Re: How to glue a heat sink on a IC

    the package is a DFN-8 and the heat sink covers the whole thing ( it even standouts a bit) I have used araldite to glue the chip...Tomorrow I will run a test to see if it has improved...

    Any ideas...
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    Closed: Re: How to glue a heat sink on a IC

    Yes, it is unfortunately the case. What other solutions could be done. Moving tracks and filled the area with copper?. Plated vias underneath of the chip?.
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    Closed: How to glue a heat sink on a IC

    Hi All,

    I have to glue a heat sink on a chip which is getting super hot. The dimension are width 6.3mm and length. Anyone could recommend something to glue it?. I have though in thermal tape but...
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    Closed: Re: Filter topology anyone knows

    sorry I will post it again.

    157856

    - - - Updated - - -

    Hi All,

    I have a flyback converter topology which is powering up a number of LEDs, it has also got a filter stage which is doing...
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    Closed: Filter topology anyone knows

    Hi All,

    Anyone could let me know what topology or how the filter posted works?.

    157850

    Thanks
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    Closed: EasyPCB export CAD file

    Hi All,

    Anyone has got experience using EASYPCB ?. I need to get step files or something similar that can be export from an EASYPCB file to solidworks and shows all the relevant dimensions for...
  9. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    Hi,

    I Can see how it could transmit the heat from the LEDs to the heat sink, I guess in that context you want to have as much copper around for hitting spreading.

    Why would be a benefit for DC...
  10. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    I also agree that copper pours can lead to unbalances in grpund which can cause misfunction of components, but I agree it is a DC problem.

    I had in the back of my mind that by increasing the area...
  11. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    ok,l see... I have always considered ground plane or planes in general an area of the same potential and that area could be also broken by components.

    Then why is better to put copper pours...
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    Closed: Re: Off-line Power factor correction

    Hi Treez,

    Thank you very much for the course it looks very complete. I will try to get back to you when I have had the opportunity to work a bit on that, thanks again.
  13. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    Hi,

    What I meant with LED board is a board where you have a input stage ( DC or AC) with a full rectification and a cap bank for filtering. Then you have a few LED strings( depending of the size...
  14. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    Thanks, could you be more specific why ground plane can not be used on a single layer PCB?. Also what benefits bring putting copper pours in the unused space?.

    Regards,
    Winsu.
  15. Closed: Re: Plane filled with copper/ground plane on one single PCB layer

    Hi Klauss,

    The reason I asked is because it is a typical constrain when designing LED boards that are sitting on a heat sink. I always have that doubt when I have to decide what to do.

    Regards,...
  16. Closed: Plane filled with copper/ground plane on one single PCB layer

    Hi All,

    I am not sure what would be better. In the case that we have a one single layer PCB what would be more advantageous for EMC?. Would we prefer to create a ground plane that would...
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    Closed: Re: Off-line Power factor correction

    Thanks asdf44. I am not facing any practical problem that I need to resolve, it is purely educative . I came across with a book that explains off line PCF LED drivers. It specifies that to achieve an...
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    Closed: Re: Off-line Power factor correction

    Hi All,

    Thanks for your answers. I agree that I definitely need to learn more about PFC. I think the main target of a PFC is make the converter function as a pure resistive load, then the power...
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    Closed: Re: Off-line Power factor correction

    Thanks for your answers. I am getting a better insight into this, but I haven't got the answer that I was looking for yet. A perfect power factor is when the real power equals the apparent power or...
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    Closed: Re: Off-line Power factor correction

    For example for a buck boost the duty cycle needs to meet this criteria to operate in DCM Vout > (D/(1-D)) * Vin. If D meets this criteria the converter is in DCM and therefore it is an ideal power...
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    Closed: Off-line Power factor correction

    I know that to achieve an ideal power factor correction power converter, the converter needs to operate in DCM during the whole line half period. I don't know why it is like that. Is it something to...
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    Closed: Re: Wht is the purpose of this op amp

    The output voltage of that Op amp is connected to an LED driver. The level pf that voltage will determine how hard the LEDs are driven. If I get this right I think the output impedance would just be...
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    Closed: Re: Wht is the purpose of this op amp

    Thank all for answering.

    The voltage follower to reduce impedance, why Do I need to reduce impedance?
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    Closed: Wht is the purpose of this op amp

    Hi All,

    I'm not sure if this thread should be in Analog or Digital but here it goes.

    I'm trying to find out why the next circuit was done. It is an op amp configured as a voltage...
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    Closed: Re: Project using Opamps-intermediate level

    Hi Betwixt,

    I understood, thanks. I think I have got now a project that combines a few things and uses many op amps. I will post here schematics when they are done.... thanks again.

    Winsu.
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