AUIR3330STRL View Datasheet(PDF) - International Rectifier
Part Name
Description
MFG CO.
'AUIR3330STRL' PDF : 30 Pages View PDF
AUIR3330S
Power on reset
time
Vin Twakemin
Vboot
charged
Vg
Time to charge the
bootstrap capacitor
If the inductance of the load is higher than 500µH, the power on reset is not
enough long to charge completely the bootstrap capacitor before turns on the power
mosfet. So the micro-processor need to implement a special sequence to start the
device without activates the output power mosfet. The µp send one short pulse
(Twake min < short pulse < Tpwr_on_rst) then wait for the bootstrap capacitor is
totally charged and after provide the appropriate duty cycle.
The bootstrap charge depends of the battery voltage, the bootstrap capacitor value and the inductance load
value.
Output high dv/dt immunity system:
The IR3330S has a high dv/dt immunity system. This
function creates a negative gate biasing if the output
voltage exceed 1.7V. So this device can be
implemented in an H-bridge configuration.
17 www.irf.com © 2012 International Rectifier
May 29, 2014
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