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TPS56C230: Can we use TPS56C230 for 12V to 5V@ 12A solution

Alec Chen
Intellectual 730 points
Part Number: TPS56C230

Dear Sir,

Our customer want to use TPS56C230 for 12V to 5V@12A solution. and we have tried to this  application on the EVM(we modify the related parts to match the 12v to 5V). It seems that we couldn't add the loading to 12A, the power fail when the load is about 11A and temperature is extra high(about 100C). and we would like you to help us with:

1. Why power fail after the load reach to 11A ? We have check the spec, and we suspect that it might hit the OCP? in the spec for the wild range temperature, the OCP will be target at 13A shown as below. Could you help confirming this?

2. How could we improve the thermal?Currently, we have asked customer is all more plane on the SW, Vout and Vout GND. and any other suggestion?

3. Do TI have the suggestion for the Iout max current for 12V to 5V and 12V to 3.3V design of TPS56C230? 

Above, please kinldy let us know and if there is any other question, please feel free to contact with me

Cheers

Alec 

  • 0
    TI__Mastermind 18510 points

    Hi Alec,

    1. Why power fail after the load reach to 11A ? We have check the spec, and we suspect that it might hit the OCP? in the spec for the wild range temperature, the OCP will be target at 13A shown as below. Could you help confirming this?

    -------So you changed the Vout to 5V based on EVM, right? And what do you change? except the FB resistor, did you change the inductor to around 2.2uH as well.

              For 5V/12A, thermal is higher but should not hit OC, do you have waveforms about Vout, IL...what's phenomenon?

    2. How could we improve the thermal? Currently, we have asked customer is all more plane on the SW, Vout and Vout GND. and any other suggestion?

    ------Large input/sw plane will be good way for thermal improve. suitable inductor is also helpful.

    3. Do TI have the suggestion for the Iout max current for 12V to 5V and 12V to 3.3V design of TPS56C230? 

    ------this is based on customer's thermal spec.. if need better thermal performance, less than 10A is recommended.

    Yuchang

  • 0 in reply to Yuchang Zhang
    Intellectual 730 points

    Dear Yuchang,

    Thanks for the update. for the EVM modification, besides the  FB resistors , We change the inductor to 2.2uH/ 20A for the testing. And power just drop 0V when the load reach around 11A. we think that this might be the thermal shutdown base on the TPS56C230's thermal spec shown as below, could kinldy let us know if out thinking is correct? thanks

    Above, if there is any question,please feel free to contact with me

    Cheers

    Alec

  • 0 in reply to Alec Chen
    TI__Mastermind 18510 points

    Hi Alec,

    we tested on EVM, it can support 5V/12A output, just the temperature a little high but can't trigger OTP.

    Could you please confirm the Switching Frequency? 500Khz or...? if not, please change mode pin jumper to 500KHz. now it only supports 500Khz application.

    And by the way, did you check the case temperature when you find the vout drop to 0V or the IC temperature at 5V/10.5A?

    Yuchang

  • 0 in reply to Yuchang Zhang
    TI__Mastermind 18510 points

    Hi Alec, How about the status? I would like to close this thread, if you have more questions, you can send yuchang-zhang@ti.com for discussion.