AUIR3330STRL View Datasheet(PDF) - International Rectifier
Part Name
Description
MFG CO.
'AUIR3330STRL' PDF : 30 Pages View PDF
AUIR3330S
Notes:
Decoupling capacitors:
During the turn on and off phase, a high current
(about a hundred mA) flows through the Vcc, the
gnd and the boot. So the bootstrap capacitor and the
decoupling must be as closer as possible. And it is
forbidden to implement a resistor in series with the
Gnd
pin.
Bootstrap capacitor charge:
The power on reset is necessary to charge the
bootstrap capacitor before turns on the power
mosfet. The bootstrap capacitor gets its charge
through the load. So the time to charge it depends of
the load.
But the power on reset doesn’t monitor the bootstrap
capacitor voltage. Its time is set internally to allow
starting the most of load without implement a special
sequence:
Power on reset
time
Vin
VVbcoboot ot
charged
Vg
Time to charge the
bootstrap capacitor
If the inductance of the load is lower than 500µH, the power on
reset is enough long to charge the bootstrap capacitor before turns on
the power mosfet.
16 www.irf.com © 2012 International Rectifier
May 29, 2014
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