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UCC21520-Q1: difference between ucc21520-q1 and ucc21520a-q1

Akihiro Hirata
Expert 5570 points
Part Number: UCC21520-Q1
Other Parts Discussed in Thread: UCC21520

Hello team,

This is general question.

I believe the difference between ucc21520-q1 and ucc21520a-q1 is UVLO threshold. (5V vs 8V)

What system is beneficial for non-A and what system is beneficial for A version?

What is the background your team create part number for UVLO 5V and 8V separately?

For example, if there is the reason such as "5V is suitable for driving FET, and 8V is suitable for driving *** " or something like this it is helpful.

Thank you.

Regards,

Hirata

  • +1
    TI__Expert 4065 points

    Hi Hirata,

    We have an appnote that goes into detail about the importance of UVLO when it comes to driving SiC FETs or IGBTs: https://www.ti.com/lit/an/slua944/slua944.pdf

    In essence UVLO helps minimize conduction losses while driving certain kinds of FETs by preventing the power switch from being driven in saturation when the output supply fails or goes too low. To determine what UVLO version is needed for your system you need to determine what FETs you will drive for your system and what voltage is optimal for driving them. 

    You are correct about the differences between the A and non A version of UCC21520, one more thing to add is the A version has a wider supply range since it has lower UVLO specs. 

    Regards,

    Krystian

  • 0 in reply to Krystian Plaskota
    TI__Expert 5570 points

    Hi Krystian-san,

    Thanks so much for the very informative apps note. This is what I would like to know and I am very clear.

    I appreciate your support.

    Regards,

    Hirata