AUIR3330STRL View Datasheet(PDF) - International Rectifier
Part Name
Description
MFG CO.
'AUIR3330STRL' PDF : 30 Pages View PDF
AUIR3330S
EMI consideration:
At vehicle level:
This is typical schematic of a high frequency power module in a vehicle (see: Error! Reference source not
found.) with the parasitic element create by the connection wire. Between the battery and the module, the voltage
is almost constant and the current switch at the application frequency. The power line creates a parasitic
inductance with the current variation that generates voltage spike on the battery line. The level of this spike is
directly linked to the conducted emissions level on the battery line. So control the current variation or the di/dt
value reduces the conducted EMI level on the battery line. In this case use the AUIR3330 (active di/dt control)
allows reducing significantly the conduced EMI level.
By analogy between the module and the load (see: Error! Reference source not found.), due to the high
inductance value of the motor, the current is almost constant and the voltage switches at the application
frequency. Due to the parasitic capacitor of the load each voltage variation create current spike on the load line.
The level of this spike is directly linked to the radiated emissions level on the load line. So control the voltage
variation or the dv/dt value reduces the radiated EMI level. In this case use the AUIR3340 (active dv/dt control)
allows reducing significantly the radiated EMI level.
19 www.irf.com © 2012 International Rectifier
May 29, 2014
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