your favour DC to DC chip

Discussion in 'General Electronics Chat' started by bug13, May 11, 2013.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    Hi

    Can you share your favour DC to DC chip here, I can do a search, but I think it might be a good idea to start with one of your favour chips.

    requirements:
    Input: 40V
    Output: 5V
    Current: ~100mA

    Thanks
     
  2. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,985
    745
    Do you mean the IC number or modules?
     
  3. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    I meant the IC number :)
     
  4. cabraham

    Member

    Oct 29, 2011
    82
    30
    Texas Instruments TPS40200 is a good choice for the specified requirement above. I use it with great success. This IC has a wimpy gate driver so I only use it for low power converters. It drives an external P-FET. At 100 mA and 5 volts the duty factor is low and the P-FET does not need high values of gate current. The 40200 is fine for this job. If the requirement was 2 amp or more, I would recommend a TPS40054-5 family. At higher currents this family is the choice due to improved gate current and synchronous rectification, as well as N-FET drive.

    But your requirement is fine w/ non-sync and P-FET drive, so the TPS40200 is the right part.

    Claude
     
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  5. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,770
    969
    I just used TI's LM5008 and was very happy with it.
    Just head over to TI and use their Webench designer and out comes a schematic/parts list,etc... You can adjust for "efficiency, parts count,price",etc... it can't get any easier.
     
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  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,985
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    bug13 likes this.
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