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Original question:

TPS25983: Vbr on CdV/dt Protection Diode

TPS25983: Are there (known) failure modes for the TPS25983?

John Westmoreland
Prodigy 160 points
Part Number: TPS25983

Tool/software:

Hello,

Are there failure modes for the TPS25983?

Maybe putting a value for the C dV/dt cap too large - ~ 1 uF?

Should an external protection diode be put on Pin 15 if driving large capacitances, say (O)2.5mF?

If the external MOSFET fails - maybe a transient could drive Pin 15 beyond the Vbr of that diode?

I've had parts fail - including two of the EVM's driving at 24V.  I removed/changed all parts not rated
to operate at 24V.

Maybe others out there can share their experiences.

Regards,
John W.

  • 0
    TI__Mastermind 38985 points

    Hi John,

    John Westmoreland said:
    Are there failure modes for the TPS25983?

    We have a document with different failure modes for this device.  Let me share that to you through mail.

    John Westmoreland said:

    Maybe putting a value for the C dV/dt cap too large - ~ 1 uF?

    Should an external protection diode be put on Pin 15 if driving large capacitances, say (O)2.5mF?

    Yes, 1uF at dvdt pin is very large. Is hiccup mode acceptable in your end application?

    Best Regards,
    Arush