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TPS22968 / parallel configuration

K.Yaita
Guru 29690 points
Other Parts Discussed in Thread: TPS22966, TPS22968

Hi Team,

According to application report, the parallel configuration of TPS22966(dual, 6A) is capable of 10A continuous load.
http://www.tij.co.jp/jp/lit/an/slva585a/slva585a.pdf

How about parallel configuration of TPS22968(dual, 4A)?
I think it isn't capable of 8A(4A+4A) in the same way.

Best Regards,
Yaita / Japan disty

  • 0
    TI__Genius 15740 points

    Hi Yaita,

    When putting the two TPS22966 channels in parallel, current passes through each channel.  However, there may be an uneven distribution of current due to an on-resistance variation between each channel.  Please see the figure below.

    When there is a difference between RON1 and RON2, then I1 and I2 will not be the same.  In the case of the TPS22966, each channel has a maximum current of 6A, but we have only recommended a 10A total maximum current for the parallel configuration.  This is because there is an assumed maximum channel to channel on-resistance variation of 33%, and this causes 60% of the current to flow through one channel and 40% to flow through the other channel.  A total current of 10A would put 6A through one channel and a higher current would exceed the maximum rating for that channel.

    Using the same 33% assumption for the TPS22968, a maximum current of 6.7A can be used.  However, this current can be raised depending on the specific configuration of the device.  Is there a specific current your customer is trying to use with this parallel configuration?

    Regards,

    Alek Kaknevicius