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  • TI Thinks Resolved

TPS56C215: Product came back from the field with a malfunctioning module

Prodigy 60 points
Robert Kim

Replies: 3

Views: 119

Part Number: TPS56C215

Dear Team-

I received the product from the field and after analyzing the power management system, I found out that the TPS56C215 failed. Upon power on, I could hear buzzing noise. After I desoldered the IC and soldered a new one, the module started operating normally. The IC did not look fried or damaged. 

I would like to know if there are any known reasons for why the chip would fail in such a way.

The input to the module is 12V from TI LMR14050SQDDAQ1. The output is 5V with 10A max load and typical operating current of 0.5A. The product is deployed outdoors in a waterproof enclosure. It has been running for about 7 months until it failed. Other products with identical hardware have been deployed in similar conditions and have not failed. 

I would like to know what happened number one, and number two if there is a way to prevent such failure from happening in the future. 

The schematic is attached.

Best,

Rob

Prodigy 60 points
Robert Kim
  • Genius 11170 points
    Yuchang Zhang

    Hi ROb,

    Did you check which pins failed? and How many boards get failed?

    You can leave Email here, we can discuss more with Email...

    Yuchang

  • Prodigy 60 points
    Robert Kim

    In reply to Yuchang Zhang:

    Hi Yuchang

    I sent you a direct message with my email but have not heard back. What is your email?

    I checked the output pin and it was shorted to the ground pins. I have not checked the rest. I have 2 boards that failed.

    Best,

    Rob

  • Genius 11170 points
    Yuchang Zhang

    In reply to Robert Kim:

    Hi Kim,

    Just saw your Email, this thread can be closed and I will give you feedback by Email.

    Yuchang

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