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DC DC booster inductor calculation's

Discussion in 'Power Electronics' started by supak111, Mar 6, 2018.

  1. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    327
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    Apr 29, 2012
    Hey guys I'm trying to use this tiny DC DC booster yx8018 to boost 2 AA batteries when they are dying to keep the output voltage to minimum 2.5v (like joule thief circuit) but not sure how to calculate the size of the inductor needed to achieve 2.5v output.

    Here is a simile diagram for what I'm trying to do from a garden solar light, my circuit just wont have the solar panel in it. Below circuit uses a 220 uH inductor to boost a low 1.25 volt NiCd battery.

    [​IMG]
     
    Last edited: Mar 6, 2018
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    The required size of inductor for different LED currents is staed in the datasheet.
     
  3. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    327
    4
    Apr 29, 2012
    I'm not powering an LED sorry I should have mentioned that. I will have to check the current of the device, hopefully it doesn't vary a lot. If I had to guess 100 to 150 mA at 3v
     
    Last edited by a moderator: Mar 6, 2018
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    9,416
    1,925
    Nov 17, 2011
    That chip is good for 30 mA only acc. to the datasheet. For 100 mA you'lll have to check other options (chips).
     
  5. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    327
    4
    Apr 29, 2012
    Ahh ok thanks Harald. I'll check on the current first, it might be 30mah
     
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