BOOT STRAP CAPACITOR DESIGN

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By Jackson Taylor

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