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  • TI Thinks Resolved

LMZ21700: Failure mode exhibited

Expert 2755 points

Replies: 4

Views: 477

Part Number: LMZ21700

I have observed a failure mode on the LMZ21700SILR regulator, the symptom is as follows: 

 

When the regulator is not powered, the impedance between pin 4 and ground is 4.7 ohms.

 

When the regulator is powered with 12V, the output voltage is zero.

 

Can you elaborate on what I am seeing please, thank you.

  • Hi Paul,

    Can you provide a schematic and pcb layout of your system? The VOS pin is susceptible to noise so the placement of the capacitor(~0.1uF) and layout of the VOS and FB is critical to proper operations.

    Regards
    Jimmy
  • In reply to Jimmy Hua:

    can you send me your email so I can forward the schematic please.
  • In reply to Paul Joseph:

    Hi Joseph,

    You can contact me directly at j-hua@ti.com

    Regards,

    Jimmy 

  • In reply to Jimmy Hua:

    Hi Joseph,

    Thank you for sending the schematic and PCB layout. The review was good and I believe the next step is to perform FA on the part to understand the root cause. I will be closing this thread now.

    Regards,
    Jimmy

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