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Original question:

THS6012: THS6012 Power Pad

THS6012: Thermal shutdown

BRUNO CROUZEVIALLE
Prodigy 200 points
Part Number: THS6012
Other Parts Discussed in Thread: THS3491

I have still have thermal shutdown with my design.

I have 2 questions :

1°/ What is the thermal resistance Junction to Top plastic case ?

2°/ What is the tolerance of the thermal shutdown junction temperature ? I read in the data sheet it is approximately 180°C, but what is the tolerance ?

Thank you, Best regards

  • 0
    Guru 48395 points

    Hey Bruno, 

    It is unlikely you are going to get a tolerance on the thermal shutdown temp - this part was designed I think about 1999, all participants gone at this point - perhaps a ckt would help find an alternate? The original design review files might have estimated this tolerance (it was definitely in the much more recent THS3491 design review) but those are sometimes hard to track down. 

  • 0
    TI__Genius 15565 points

    Hello Bruno,

    Michael is correct, we don't have information on the tolerance of shutdown. However, I can put in a request to get the thermal resistance Junction to Top. It should take 1-2 weeks to get this info.

    Best,

    Hasan Babiker

  • 0 in reply to Hasan Babiker31
    TI__Genius 15565 points

    Hello Bruno,

    Here is the thermal info for the part:

    Result- Theta JA-High K (standard datasheet value):

    43.6

    Result-Theta JC, top (standard datasheet value):

    51.2

    Result-Theta JB (standard datasheet value):

    25.0

    Result- Psi JT (standard datasheet value):

    14.1

    Result- Psi JB (standard datasheet value):

    25.0

    Result-Theta JC, bottom (standard datasheet value):

    12.4

    Best,

    Hasan Babiker

  • 0
    Guru 140200 points

    Hi Bruno,

    why are you asking for "the tolerance of the thermal shutdown junction temperature"?

    Kai

  • 0 in reply to kai klaas69
    Prodigy 200 points

    Hello,

    I'm asking for the tolerance, because I have the impression that it is more than 10°C.

    I have devices that shutdown whereas they have the same case temperature as others that don't shutdown.

    Thank you.

    Bruno

  • 0 in reply to BRUNO CROUZEVIALLE
    Guru 140200 points

    Hi Bruno,

    it's very difficult to extrapolate from the temperature measured on the top of plastic package to the internal die temperature. I would recommend to use a very tiny thermocouple and to measure the temperature directly at the thermal pad on the bottom of package. Thread the thermocouple through a small hole in the PCB (via, or else) and directly touch the thermal pad. Use a drop thermal paste to improve the heat transfer. I bet you will see smaller variations of thermal shutdown temperatures now.

    By the way, if the thermal shutdown sets in again and again you should think about making some circuit changes. The life time of OPAmp drastically decreases when the chip temperature is such high for longer periods.

    Kai