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Original question:

UCC21736-Q1: Wrong informations of UCC21736

UCC21736-Q1: Vee-Vcom of 0V vs. Vee UVLO

Roman Legenstein
Prodigy 10 points
Part Number: UCC21736-Q1

Hello,

it was mentioned in other threads that there are datasheet inconsistencies regarding the gate driver UCC21736-Q1.

I would like to know if switching is possible with a Vee-Vcom of 0V?

In the datasheet (from APRIL 2020–REVISED MAY 2020) it is mentioned that Vee-Vcom of 0V is an exemplary case (e.g. in 6.9 as information in Electrical Characteristics),

but there is the contradiction that the Vee UVLO feature is supposed to keep the device output low in case Vcom-Vee is smaller than 3V.

Thank you for your help,

BR Roman

  • 0
    TI__Genius 10652 points

    Hi Roman, 

    Roman Legenstein said:

    I would like to know if switching is possible with a Vee-Vcom of 0V?

    No Because this will not satisfy the UVLO condition. VEE must be -3V or less for switching. 

    Roman Legenstein said:

    but there is the contradiction that the Vee UVLO feature is supposed to keep the device output low in case Vcom-Vee is smaller than 3V.

    In that test condition list at top it states "unless otherwise noted". For vee rising and falling threshold, VEE-COM is specified. 

    If this answers your question please let me know by pressing the green button. 

    Best

    Dimitri