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LM25037-Q1: PMP11186 Inquiry

Cedrick
Expert 8270 points
Part Number: LM25037-Q1
Other Parts Discussed in Thread: PMP11186

Hi,

Good day.

Our customer has an inquiry about the PMP11186 which uses the LM25037-Q1. Kindly see below:

I have been going through the PMP11186 Schematic which uses a push-pull topology, therefore, if I add more of the same type of Q1, Q2, Q3, Q4 and the DC voltage into the center tap primary side transformer, will the power increase?

www.ti.com/.../tidrte3.pdf
and www.ti.com/.../PMP11186

I have made some changes in the design as follows; kindly let me know which one will work.
Please refer to the attached schematic."



Looking forward to your inputs.


Regards,

Cedrick

  • 0
    TI__Guru 63445 points

    Hi,

    In addition to parallel more MOSFETs, you also need to change the transformer to bigger, and your current setting to be bigger along with higher current setup.

  • 0 in reply to Hong Huang
    TI__Expert 8270 points

    Hi Hong,

    Thank you for your response.

    I've got a feedback from our customer:

    It is nice to have received positive feedback from you. I also thought of the same thing to change the power transformer rating to match the new power.

    Besides that, I would also like to ask for each pair of MOSFETs that I add, how much power is generated from the pair, is it 5W, 50W, or 100W? I have not found vivid information in the technical information that explains this. In addition to that, previously I sent you two photos of the schematic I intend to use, therefore, should I connect the positive Net Tie to the positive terminal of the battery as shown in picture 1 or should I leave it floating as shown in picture 2?

    Picture 1


    Picture 2




    Regards,

    Cedrick

  • 0 in reply to Cedrick
    TI__Guru 63445 points

    Hi,

    The output power is not calculated by how many MOSFETs in parallel. But as an intuitive thinking, parallel more MOSFETs may lead you to more power. For a specific design, parallel one MOSFET to original one MOSFET may give you 150% to 180% power increase along with other needed component change.

    To understand how a switch-mode power supply converts power, you may need to read some books on power electronics. It is not possible to explain in a few sentences.

    On how to connect a converter to batter, usually you need to refer to its associated user's guide to find out.

    I suggest you can find an engineer with power electronics knowledge to help.