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TL783: TL783 extended temperature (to -20 degree C)

Idan Ozana
Intellectual 480 points
Part Number: TL783


Hi,

My name is Idan and I'm electronic engineer.

In my application, I need to drive a relay coil (~100mA) from nominal 28V battery that can change up to 100V/50msec. From your website, I sew the TL783 High-voltage Adjustable Regulator that I might fit for this kind of application. From the first glint at the device datasheet I noticed that the device can operate only at Operating virtual junction temperature of 0 to 125 degree C. Is there any way to extend that range to -20 degree C? How can I quantify the junction temperature to ambient temperature?  

Thanks a lot,

Idan        

  • 0
    TI__Guru 55940 points

    Hi Idan,

    The operating junction temperature must be within the range 0 to 125C for the LDO to achieve the specified performance.  This is the range for which we designed, characterized, and tested operation of this particular LDO.

    You can calculate the approximate junction temperature using information provided in the Thermal Information table.  You first need to calculate the power dissipated in the LDO (PD = (Vin - Vout) * Iout).  You can then multiply this by the Junction-to-ambient thermal resistance which is provided in the table.  This provides the delta between the ambient temperature and junction temperature; therefore, the final step is to add this delta to your ambient temperature.

    For example, if you were to have an ambient temperature of -20C and were dissipating 1W in the KTE package of the LDO, your junction temperature would be approximately -20C + 23C = 3C.

    Very Respectfully,

    Ryan