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TPS54550: TPS54550 failure

Redwood
Expert 1060 points
Part Number: TPS54550

Hi, 

I have a chain of TPS54550 voltage regulators. If there is a short at the input of TPS54550 IC, what will  happen? I wonder, the short at the input of this voltage regulator will crash everything on the chain of voltage regulators and cause total power loss on PCB or is there anything to protect from this?  If the problem occurs time to time with different frequency what kind of noise can be expected? Our circuit works couple of days without a problem, but  time to time we are experiencing intermittent shorts at the input of the voltage regulator which is supported with a chain of same kind of voltage regulator. I am trying to figure out the effect on the entire board. Thanks and best regards,

  • 0
    TI__Guru**** 191445 points

    The TPS54550 will have some voltage supply as the input.  If that supply output is shorted then the input to TPS54550 is 0 V and the TPS54550 will not turn on.

  • 0 in reply to JohnTucker
    Expert 1060 points

    Hi, 

    What if the output of TPS54550 is shorted, what will happen to the input of TPS54550?

    The problem is when the circuit TPS54550 draw more current and max when it is shorted. This cause high current demand. is there any feature that after a certain current, TPS54550 output voltage will go 0V while the current value requirement from the supply source will go 0 amp too. This way, short of output voltage regulator won't affect the rest of the circuit. Otherwise, when there is a short at the output of TPS54550, then high current demand will propagate through the chain of power regulators and shuts down the entire board. Is this true?  Thanks and best regards, 

  • 0 in reply to Redwood
    TI__Guru**** 191445 points
    If the TPS54550 output is shorted, the output voltage will drop to near 0 V, but the current can remain at the current limit. What you are looking for is hiccup mode current limit. What is your input voltage range?