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TPS61030 application causes cell heat on discharge

Soumitra Bhattacharjee
Intellectual 810 points
Other Parts Discussed in Thread: TPS61030

Hi all

I have a TPS61030 application that utilizes 3 nos of AA size cells (1.5V each) and a current limiting front-end at the output that supplies a steady (but user-selectable) current option of either 500mA or 1.0A.

The circuit works well but the cells start heating up after some time while on continuous discharge and then actual supply current drops till the device locks up (typically in an hour or so). The issue is the same with ordinary Zinc-chloride cells or heavy duty Alkaline cells. I haven't tested with NiMH or NiCD cells yet. 

Any pointers to this would be greatly appreciated.

At the moment i have thought of hooking up a simple timer that alternately switches on a low RDSon NMos device connecting to two different battery packs so that the supply can remain steady while one battery pack can cool-off while the other discharges and then switch over, perhaps in half-hour cycles. But this is going to be a clunky solution which i would preferably like to avoid.

Thanks and regards

Soumitra

  • 0
    TI__Intellectual 2370 points

    what's your load continues current?If you draw too much current from the battery ,it will heat up.But it should not be a problem of chip itself.

  • 0 in reply to Jim Chen (SEM)
    Intellectual 810 points

    Hi Jim

    Thanks for the reply. My load is approx 500mA continuous current.

    I agree there should be nothing to do with the chip itself but I was hoping the alkaline cells would be able to deliver the current without heating up. My thoughts went to any design oversights or points i may not have addressed that led to the heating. Maybe it wouldnt be an issue with cells with a higher mAh rating but is there any other method apart from the timer/switching method to ensure continuous supply without heat-up ?

    Regards

    Soumitra