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TL783 burn-out problem

Gregory Voge
Prodigy 10 points
Other Parts Discussed in Thread: TL783

I am designing a battery charger to float charge the 72 volt battery pack in my electric car.  I am using the TL783 adjustable voltage regulator as the basis of the charger.  The assembled prototype works just as designed when I connect it to a dummy load,  which was a light bulb.  But the moment I connect the charger to the battery pack, the regulator instantly self-destructs.  I suspect that on connection to the battery pack, there is a sudden surge of current that the  regulator's built-in short-circuit protection circuitry cannot handle.  This suggests that I need to add a capacitor or inductor to the regulator's output to dampen the sudden current surge, but I have no idea as to what the size of the capacitor or inductor should be.  I would appreciate any suggestions that will keep me from burning up these regulators.

 

Thanks,  Greg

  • 0
    TI__Mastermind 36110 points

    The root cause of your problem could be several things.  One could be excessive power dissipation caused by a large voltage drop across the LDO coupled with excessive current.  Another problem could be voltage spikes caused by hotplugging your input source or load.  I do not think a capacitor or inductor will solve these problems.  The datasheet provides additional guidance on fault and failure modes.  Once you identify the root cause of the problem, you will be able to design an solution, which migh involve external current limiting or voltage slew rate limiting.