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UCD3138064: How to sync Interleaved PSFB (two phase PSFB)

Jack Wang
Intellectual 320 points
Part Number: UCD3138064
Other Parts Discussed in Thread: UCD3138, , UCD3138PSFBEVM-027

Hi TI Experts,

  • We are planning to construct an interleaved PSFB (two phase, 180 degrees). Each phase will have its own 400Vdc input, and these will be combined to produce a 12V output at a maximum of 375A.

  • I have a few questions about this:

    1. Is it possible to use two UCD3138064s (64-pin + 40-pin) for the interleaved PSFB? Can they be connected with SYNC? Is there an example that shows how two UCD3138 devices can synchronize their phases (and delay)?

    2. Can one UCD3138064 handle the feedback control, with the other following its duty cycle? This way, I wouldn't need to worry about current balancing.

Let me know if you need further clarification on any points. Thanks a lot.