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TL783 performance below 0ºC, revisited

Other Parts Discussed in Thread: TL783

Reference to the forum comments posted on 27/06/11 by Paul Toffolo and responded to by Ron Michallick Linear Applications.

The forum post indicates TL783 will operate down to -23 ºC for a worst case production variable and to -40 ºC for less severe production variables.

I understand the low temperature issue is related to start-up with two of your production processes shifted.

 

We have hundreds of these devices successfully installed in a continuously running 60mA constant current configuration in outside cubicles at fixed locations in the UK.

We have had no temperature related failures in the field. (The average minimum temperature in the UK is around -6ºC while our spec calls for -25ºC minimum).

Most units are continuously powered but potential future application runs in start/stop mode.

 

Is there a way in which we could confirm that the devices we are using at any given time would not suffer from the rare low temperature start-up issue?

a) for TL783 devices in a continuously running application?

b) for TL783 devices in a stop/start application?

Would it be possible for T.I. to confirm OK operation down to -20ºC? Or is it a case of; can't meet -25ºC, therefore stating pass test point of 0ºC?

  • Gavin,

    The best way to ensure the TL783 is fully functional at -25C is to production test the device in the application at this temperature.

    Once the TL783 is passing a constant current it will continue to do so below -40C. 
    In start and  stop applications there is a small risk for below -20C.
    No guarantees below data sheet 0C are stated or implied.

    I will request that TL783 be considered for temperature extension.

  • Thank you Ron for the information.

    Temperature extension would be of great benefit, I'll watch for changes.

    Best regards, Gavin

  • Hi TI Support,

    We have recently started using the part, it work fine as expected for our 42VDC source. O/P: 24VDC @ 66mA.
    I need to know what is typical operating temperature for this part? The latest datasheet which has been revised on January 2015 is also not having any details of operating temperatures though it has junction temperature only with max upper limit.

    Thanks.
  • Hello Aditya,

    We only guarantee the operation of the device from 0C to 125C.
    As Ron mentioned before, it is likely it should be able to work below 0C, but this would have to be a production test and we would not guarantee the operation below 0C whether or not the device starts up at 25C and cools down or if it starts up already at -25C.

    Best,
    Michael