bootstrap capacitor for IR2111 driver + Mosfet B25NM60N

Discussion in 'The Projects Forum' started by julius64, Jun 17, 2008.

  1. julius64

    Thread Starter New Member

    Jun 17, 2008
    6
    0
    Hi:
    I need solved a next problem: My drivers IR2111 dont work fine, and I to know what bootstrap capacitor is necesary for driver IR2111 with a MOSFET B25NM60N 600V, 20A. If you know something this, you can need help about this?, Or please give me equation for calculating the value of Bootstrap capacitor.
    Very thank
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Cboot > (Qg + Dmax*Tsw*Idrv ) / ΔV

    Where:
    Qg is the gate charge of the MOSFET
    Dmax is the maximum duty-cycle​
    Tsw is the switching period​
    Idrv is the average consumption of the driver​
    ΔV is the ripple you accept across the bootstrap capacitor​
     
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