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Negative pulse on TPS5430 VIN pin

Red Yen
Expert 4360 points
Other Parts Discussed in Thread: TPS5430

Hi Team,

in lighting surge test in "power off " condition, VIN pin will feed into -10V and around 50us, is this pulse has any impact for device?

If passed, I have other two questions,

1) Can TPS5430 tolerance negative pulse to -20V with duration ~1ms?
(2) In I/P of TPS5430, there is a diode reversed shunt to ground. When negative pulse is coming, the negative voltage will be clamped to -Vf and large current will go through the diode. So what is maximum transient current or power of this diode?
 

 

  • 0
    TI__Guru**** 191445 points

    Absolute maximum for Vin is -0.3 to 40 V.  That is a long term DC coltage rating.  It can probably tolerate transient negative voltage of  a 1-2 V for 10 to 20 nsec.  %0 usec is probably too long, as well as 1 msec.  The diode structure you reference is probably the ESD structure.  It will try to clamp at .7 V, but if you apply 10 V to it, it will likely draw excessive current and fail.  I do not have any data, but if you exceed the abs max, then nothing is guaranteed.  You can try to see if it will pass, but I do not expect it to.