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UCC27519A-Q1: Maximum Allowable Power Dissipation (under DC) given absolute ratings.

Theresa Mrazkova
Prodigy 10 points
Part Number: UCC27519A-Q1

Hello, I am working on derating this part and have been struggling to figure out how to find out what is the maximum power that this device can dissipate without getting damaged. I found the rated max voltage VBR (20V) and max rated current (4A). I am working on a DC derating report and cannot really give you a frequency value that I will eventually be working with. Could someone help me figure out what this parameter value is? Thank you

UCC27519A-Q

  • 0
    TI__Genius 13445 points

    Hi Theresa,

    Thanks for your interest in our device, my name is Mamadou Diallo, I am the applications engineer supporting low-side drivers.

    The maximum allowable power dissipation within a gate driver is a function of TJ(MAX) (Operating ambient temperature), RθJA (junction-to-ambient thermal resistance), and TA(ambient temperature). The maximum allowable power dissipation at any ambient temperature can be estimated using PD = (TJ(MAX) − TA) / RθJA). If this dissipation is exceeded, the die temperature can rise above the TJ(MAX) and damage the device.

    Having said that, this device is designed, characterized, and tested for use within the Recommended Operating Conditions.  When outside of the  the Recommended Operating Conditions (above a junction temperature of 140C for this device), the performance in your application may or may not meet the performance depicted in the datasheet.

    Additionally, knowing your operating conditions, you can calculate the power dissipation within the gate driver using "Section 12.4" of the datasheet. You will notice that this power dissipation is dependent on many factors including gate resistance, load, switching frequency and supply voltage and quiescent current.

    Please let us know if you have further questions or press the green button if this addressed your questions.

    Regards,

    -Mamadou