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Bootstrap capacitor

  1. Apr 2, 2015 #1
    currently am using high side driver and i need to calculate the value of Cboost.
    may i how i determine the "Bootstrap capacitor leakage current".
     
  2. jcsd
  3. Apr 2, 2015 #2

    Svein

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    Show a figure or a schematic, otherwise we cannot answer.
     
  4. Apr 2, 2015 #3
    I hope that i have attached the right schematic. I apply 15v to Vcc and 5v pulse to IN.
    when i measure HO is zero. but i need to have 15V output from my HO. hope you are able to help me
     

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  5. Apr 3, 2015 #4

    davenn

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    so what is the chip ?
    what does its datasheet say about it's use ?
    post a link to the datasheet

    Dave
     
  6. Apr 3, 2015 #5
  7. Apr 3, 2015 #6

    Baluncore

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  8. Apr 3, 2015 #7

    davenn

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    ah hah :rolleyes: :smile:

    Billy fok
    some advice .... if you want people to help you and give your good answers
    You really have to please start supplying ALL the information in your posts
    none of us are mind readers :wink:

    regards
    Dave
     
  9. Apr 4, 2015 #8

    Baluncore

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    The procedure for calculation of Cboost can be found in IR application note AN-1123.
    http://www.irf.com/technical-info/appnotes/an-1123.pdf

    See pages 9 through to page 12, where Cboot > Qtot / Vdrop.
    We do not know the part number of the driven MOSFET/IGBT gate so we cannot know Qtot, the total gate charge.
     
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