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UCC28951-Q1: I am planning to design an SMPS with the following specifications using the master-slave method of UCC28951.

chulho jeong
Prodigy 90 points
Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951, UCC28950

Tool/software:

Hello..
I am planning to design an SMPS with the following specifications using the master-slave method of UCC28951.

-. Specifications
INPUT: DC 350V ~ DC 420V
OUTPUT: DC 52V 1,500kW (approximately 289A)

-. Questions are as follows.
1. Can UCC28951 operate as one master and a maximum of how many slaves?
2. If there are design reference documents and design data (design files and PDF files, etc.) for the master-slave method of UCC28951, please share them.
4. If there are design reference documents and design data (design files and PDF files, etc.) for synchronous rectification when configuring the output as a current doubler method, please share them.

Thank you.

  • 0
    TI__Guru 50050 points

    Hi Chulho,

    For questions 1 and 2:

    1. It is really up to you. How many would you like to put in parallel? Are you thinking 10 or more for this power level?

    2. Here is an application note showing how to parallel 3 or more UCC28950's (the difference between the UCC28950 and UCC28951 is the maximum duty cycle in current limit 95% and 97%)

    for the last question. I have not seen this before but will ask around.