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UCC27532 OUTH resistor

kura
Genius 4700 points
Other Parts Discussed in Thread: UCC27532

Our customer  consider to use UCC27532.

In datasheet P6, OUTH connect to OUTL through resistor.

www.tij.co.jp/.../slusbd9.pdf

Please let us know what aim of this placed resistor.

  • 0
    TI__Intellectual 2910 points

    Kura,

    The resistor you are referring to is used to tune the turn-on slew rate of the MOSFET or IGBT. During turn-on, current flows out of the OUTH pin, through this series resistor, and into the gate of the power switch. This resistor is optional, but often times it is necessary to slow down the dV/dt of the power switch to meet design requirements. A larger resistance value will result in slower turn-on.

    The typical application diagrams do not show a resistor between OUTL and the IGBT gate because most of the time, the fastest turn-off is desirable to limit switching losses. 

    If this answers your query, please click the "verify answer" button below. 

    - Daniel

  • 0 in reply to Daniel Ruiz
    Genius 4700 points

    Daniel-san
    Thank you for your reply.

    This resistor is to tune the turn-on slew rate of the MOSFET or IGBT.
    Is the aim of tune to have current limit 2.5A or reduce on SW noise?

    If customer meet current below 2.5A and they don't have SW noise ,they don't need to add this resistor.
    Is my understanding correct ?