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TS12A12511: TS12A12511DRJR power supply -5V overcurrent on PCB brd

wei wang91
Prodigy 90 points
Part Number: TS12A12511

Hi experts.

We met a strange issue with the application of TS12A12511DRJR.   Submit a help thread before, but no finding, so we continue to debug it .

We use +5V , -5V power TS12A12511DRJR to pass -4 - -1 volt voltage.  When we power TS12A12511DRJR. , -5V power overcurrent.

We follow datasheet simple circuits, with thermal via connect to GND.

So , we did some debug :

1: isolate +5V ,-5V power from other circuits, only to power TS12A12511DRJR

2: only power on +5V , it is ok, not overcurrent.

3:only power on -5V,  it overcurrent . We removed -5V path capacitor, same result , overcurent.

2 questions from us:
1:  thermal via connect to GND is ok? 

2:only power on -5V  is not a normal procedure ? so ,overcurrent is expected ?

3: if only power on -5V is ok,  what 's the answer for -5V overcurrent?

thanks a lot.

  • 0
    Prodigy 90 points
    4: if only power on -5V ,this action will permanently damage TS12A12511DRJR?
  • 0 in reply to wei wang91
    Prodigy 90 points
    Hi experts

    we found "The Exposed Thermal Pad must be electrically connected to V– or left floating."
    So, it means we connnect thermal via to GND is the root cause?
  • 0 in reply to wei wang91
    TI__Mastermind 45495 points

    Wei,

    The thermal pad is internally connected to V- and must be connected to V- or left floating.  If you have -5 V on the V- pin and the thermal pad connected to ground you will create a 5V short to ground through the IC.  You should see the overcurrent issue go away if you connect the thermal pad to your lowest voltage node -5V.  

    Please let us know if this doesn't solve the issue. 

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Prodigy 90 points
    thanks Adam, i think it shoulb be the roort cause. at the beginning of project, i asked chinese TI engineer he told me it can be conncected to GND.
    we will have next PCB buit, and will try it, and let you know the result. thanks a lot.