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TPS60240: TPS60240: Boost voltage on the pins.

user6483867
Prodigy 40 points
Part Number: TPS60240

Hi,All.

Can a boost voltage appear on the pins when TPS60240 fails?

If so, is the upper limit of the boost voltage that appears on the external pins at the time of failure structurally determined?

  • 0
    TI__Guru 68595 points

    Hi, 

    Thank you for posting.  By "boost voltage"  do you mean an upstream boost converter?  It depends how the part fails.  If the pin fails to ground, you may short the boost output and damage if there is no overloading protection.  Note that a boost converter does not have natural mechanism to protect against output short. 

    Thanks,

    Youhao 

  • 0 in reply to Youhao Xi
    Prodigy 40 points

    Hi Youhao,

    I mean "boosted voltage" by higher voltage greater than supply voltage.

    Among the answers to "TPS60240: Step-Down Operation", there was a part of "The Device Is Permanently Operating As Voltage Doubler".

    e2e.ti.com/.../tps60240-step-down-operation

    Is this device a structure that does not perform boosting operation other than as a voltage doubler, even in the event of a failure?

    Do the eight pins of this device have an operating mode or failure mode that causes a voltage that is more than twice the supply voltage?

  • 0 in reply to user6483867
    TI__Guru 68595 points

    Hi, 

    It depends how the device fails.  However, in  the voltage doubler, the boost voltage can only be produced when the circuit is switching normally.   At this moment we don't have a pin failure mode summary to share, but if the circuit fails, I would not expect the circuit could produce twice the supply voltage. 

    Thanks,

    Youhao