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TPS53647 phase interleaving

David Sandler
Intellectual 1910 points
Other Parts Discussed in Thread: TPS53647

Hi,

I am running the TPS53647 as a 2-phase 35A design.

 

Section 7.5.1.10 says to connect CSP2, CSP3 or CSP4 to V3R3 to select the maximum active phases.  Table 3 says that I can connect CSP3 to V3R3 for 2 active phases. 

There are two interleaving modes supported, “4 phase individually” and “1/3 and 2/4 phase interleaving”.  I can’t find any explanation for what 1/3 and 2/4 interleaving means.

I currently have CSP3 connect to V3R3 with a pull-up.

My assumption is that phase 1 and phase 2 are going to be interleaved.

 

1)       Should CSP3 be connected to V3R3 with a pull-up or direct?  It doesn’t say.

2)      Am I correct that phase 1 and 2 will be active?

3)      What does 1/3 and 2/4 interleaving mean?

Thanks,

David

  • 0
    TI__Expert 5965 points

    Please see my reply below:

    1)        Should CSP3 be connected to V3R3 with a pull-up or direct?  It doesn’t say.

    ->  Either way will work, recommend to connect CSP3 with 0 ohm.

    2)        Am I correct that phase 1 and 2 will be active?

    ->   Yes, if CSP3 is pulled up to V3R3, phase 1 and 2 will be active.

    3)        What does 1/3 and 2/4 interleaving mean?

    ->   This means under 4-ph operation, ph1 and ph3 will have same phase angle, ph2 and ph4 will have same phase angle.