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Original question:

LM5032: AN-1820 LM5032 Interleaved Boost Converter

LM5032: Interleaved Topology 4 MOSFETs vs 2 MOSFETs

rajesh beesetty
Expert 1335 points
Part Number: LM5032

Tool/software:

Dear Experts,

I am planning to design a DC-DC converter ranging 10KW. THe topology I am using is 2 phase interleaved Boost Topology. In the document AN-1820 LM5032 Interleaved Boost Converter (Rev. A) (ti.com), Page:2 I see 2 IGBTs and 2 Diodes are used. However, In another document (Power Topology Considerations for Solar String Inverters and Energy Storage Syst), Page: 7, the two diodes are replaced with 2 mosfets. Could anyone explain me why this design is adapted? Is it OK to go with 2 diodes? Does MOSFETs give any edge over? Is there any difference in the control fundamentally?

Regards,

Rajesh BN.

  • +1
    TI__Guru 73785 points

    Hi,

    When D1 D2 replaced with MOSFETS which are like diodes if no drive signals to them. The drive signals only show during the same time of the diodes conduction so can have lower forward voltage drop to reduce conduction losses. This is called synchronous rectifier.