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  • TI Thinks Resolved

TPS40322: Current balanceing issue

Intellectual 350 points

Replies: 6

Views: 160

Part Number: TPS40322

Hi Experts,

Sorry for selecting  wrong part number,the correct part number is TPS40322! 

We encountered two phase non-balance isse at start-up, The one of phase  would damaged caused by non-balance phenomenon

The one would operate BOOST,the other one would operate BUCK ,pls see the figure as below.

Please give us some suggestions ,thanks.

  

  • Hello Steven,

    Kindly share the schematic diagram and PCB layout to better understand the issue. If the data is confidential, you can share your email address so I can contact you directly.

    Best regards,

    Excel

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml)

  • In reply to Excel Regidor:

    Hello Steven,

    Just a soft reminder. Kindly share the schematic diagram and PCB layout to help you better with your issue. I can contact you personally if you share your email address.

    Best regards,

    Excel

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml)

  • In reply to Excel Regidor:

    Hi Excel,

    Please have a look as follows,thanks.

  • In reply to Steven Rogers86:

    Hi Steven, 

    The only problem  I notice on schematic is the compensation. TPS40322 is a voltage mode controller, type-III compensation is needed. 

    I'm not sure if the current imbalance is related to unstable loop. 

    Can you populate R624, C619 and C620, and check if the issue goes away?

    Thanks

    Qian

  • In reply to Qian Chen:

    Hi Qian,

    Thanks for your suggestions ,it's helpful to us.

    it's server panel application ,2 parallel server power as input ,we found the 12V input rising time would impact the TPS40322 normal power up or not.

    The rising time of slower one is ok,and vice versa.

    Could you tell us what kind of reasons would cause this phenomenon ,thanks.

    TPS40322 power up ok.

    TPS40322 power up fail 

  • In reply to HAN LEE:

    This issue is supported offline. 

    The post will be closed. 

    Thanks

    Qian

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