BOOT STRAP CAPACITOR DESIGN


FOR ABOVE 10KHz
Above this range, frequency have less influence in boot capacitor design
CAPACITOR VALUE =TOTAL GATE CHARGE /VOLTAGE DROP ACROSS BOOTSTRAP DIODE
EXAMPLE


  • mosfet - CSD19534KCS
  • BOOTSTRAP DIODE - UF4007


from data sheet

TOTAL GATE CHARGE =16.4 nC
VOLTAGE DROP ACROSS BOOTSTRAP DIODE =0.7

C=16.4 nC/0.7 = 23nF