• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 310 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS62260: Heats up and consumes a lot of current

Yoonsang Cho
Prodigy 10 points
Part Number: TPS62260


Some TPS62260 of our products heats up and consumes a lot of current(100mA more than normal product) .

Without C1, could the IC(TPS62260) fail? Our circuit doesn`t contains C1.

  • +1
    TI__Mastermind 21580 points

    Hi Yoonsang,

    Having C1 is not a requirement. Are some of the devices behaving normal (no extra current)? Can you share your schematics and also a scope shot of VIN, VOUT, SW and inductor current? 

    Best regards,

    Varun

  • 0 in reply to Varun John
    Prodigy 10 points

    Hi Varun,

    Thank you for your reply.

    This is our schematics.

     

    I have no scope shot, but VIN = 5V, VOUT & SW = 1.8V and Current consumption is under 100mA.

    In TPS62260 Datasheet, it is mentioned as

    .

    According to your answer, C1 is not required...I am confused with that.

    Best regards,

    Yoon-sang

  • +1 in reply to Yoonsang Cho
    TI__Mastermind 21580 points

    Hi Yoon-sang,

    C1 is required when you want to have a good load transient response. C1 usually helps improve the control loop response. It is unlikely C1 is the cause of the higher input current here. The only way C1 could be the cause here is if the loop is unstable and VOUT is oscillating. The input currents can then be higher.

    Can you disconnect the 10K resistor (R4000) and everything after C4000 on the 1.8V rail and measure the input current?

    We would need the scope shot of VIN, VOUT, SW and inductor current to get an idea of the load current and analyze device behavior.

    Best regards,

    Varun

  • 0 in reply to Varun John
    Prodigy 10 points

    Thanks for reply.

    I asked 2 failure ICs for decapsulation-analysis to an analytic company and below the result of analysis.

    Because of not being a capacitor, is it possible to happen the problem(Pin1 : Leakage curve, Pin5 : Short curve)...? 

    Please Reply,

    Best Regards,

    Yoon-sang 

  • 0 in reply to Yoonsang Cho
    TI__Expert 8756 points

    Hi Yoo-sang,

    I apologize for the delay in response. Varun is out of office since last few weeks and we somehow missed this thread. I really apologize for the inconvenience. 

    Regarding your request, I do not think without C1, the IC would fail. Can you provide the waveforms as Varun mentioned in his post earlier? It would help us better analyse the issue.

    Thanks!

    Best regards

    Sneha