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TPS65130 Virtual Junction Temperature

Don Foong
Expert 4100 points
Other Parts Discussed in Thread: TPS65130

Hi Team,

We are working with one customer on TPS65130 for one of the industrial control board design. It is consider for converting from 5Vin to +/-15Vout. Customer feedback that their product application enviroment temperature can be as high as 110degC and they are keen to know more about the absolute max rating for Tj.

Pls help to advice for below customer questions regards to device junction temp, thanks in advance.

1. How should we interpret 'virtual junction temperature' ? Is this the same as maximum junction temp that stated in typical datasheet ?

2. Is it right to say, if the application keep its Tj < 125degC, there shall be no functionality issue to TPS65130 ?

  • 0
    TI__Intellectual 1065 points

    Hallo Don,

    "Virtual Junction" is a JEDEC standard term and is defined as,

    The theoretical point or region in a simplified model of the thermal and electrical behavior of a semiconductor device at or in which all the power dissipation within the device is assumed to occur.

    In plain English, the virtual junction temperature assumes that the temperature of the die in an IC is constant across the die, and that there are no hotspots. In a power device, this is not 100% true, but it is close enough for most practical purposes and makes thermal calculations much easier.

    If the junction temperature remains below 125°C, the TPS65130 device should operate correctly. However, if the ambient temperature of the application is 110°C, please make sure that the thermal design is done properly and is fully tested during development. With an ambient temperature so close to the absolute maximum rating of the device, you don't have much margin, so you must be sure that the device temperature is properly controlled. I strongly recommend you make thermal measurements under worst-case conditions to make sure the device temperature stays below the maximum allowed.

    Best regards,

    Nigel

  • 0 in reply to Nigel
    TI__Expert 4100 points

    Hi Nigel,

    Thank you for the feedback.