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UCC29002: Is there any newer current share device than UCC29002?

Kazuya Nakai59
Guru 21645 points
Part Number: UCC29002

 Hello guys,

 One of my customers is using UCC29002 for their current products. But UCC290002 sometimes doesn't share the current correctly. Probably it was caused by any external noise.

So they are looking for stronger current share device against external noise than UCC29002.  

Is there recommended current share device?

 Your reply would be appreciated.

 Best regards,

 Kazuya Nakai.

  • 0
    TI__Mastermind 34465 points

    Hello Kazuya,

    Any electronic controller is subject to interference from noise pickup and a current share controller is no exception.
    The UCC29002 measures small changes in the output current of each load module and uses this measured current to make very small changes in the load current.
    This is the principle behind load current sharing.
    With proper component selection and care in the pcb layout load sharing accuracy of 5% at full load is readily achievable with the UCC29002.

    Regards

    John

  • 0 in reply to John Griffin1
    Guru 21645 points
    Hello John,

    The customer is going to use UCC29002 at output of AC/DC converter module. So LS terminal wire is brought out from PCB to connect other UCC29002 of other AC/DC module. Should any R-C filter be added to the LS terminal wire to avoid noise influence?

    Thank you and best regards,
    Kazuya Nakai.
  • 0 in reply to Kazuya Nakai59
    TI__Mastermind 34465 points
    Hello Kazuya,
    It is not advisable to add any RC filtering on the LS pin.
    The LS signal represents the load signal for the module with the highest load current. All of the other modules are forced to output a current equal to this module. If you add any filtering on LS this will adversely affect the loop dynamics of the overall system.
    It is best to route the LS signal away from any source of switching noise.
    This should be easy enough to do since all of the signals on the output of the power supply are DC or very low frequency AC (hopefully).
    Layout and single point grounding as well as differential current sensing and the use of low impedance busbars are very important because a few mV's of voltage difference can mean a significant change in the load current.
    Regards
    John