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LM5021: LM5021 applied Two-tube Forward Design Consult

Jayce Luo
Prodigy 590 points
Part Number: LM5021
Other Parts Discussed in Thread: PMP10215, , PMP40281, UCC256402

Hi, TI expert,

Currently need to make a two-tube forward design with 300~1000V input Voltage, 24V output Voltage and 200W output Power.

Suppose LM5021 is the suitable device for this design, taken PMP10215 as a reference. 

Q1: Do you have a better device to recommend? 

Q2: Is there any documents to guide the design of transformer and Inductance parameter within the Two-tube Forward Circuit?

Best Regards,

Jayce Luo

  • 0
    TI__Guru 71675 points

    Hello,

    You can use the LM5021 in a two switch forwarded design.

    We have a design tool that can be used to design many different power typologies.  A two switch forwarded is one of the power stages.  This will give you the transformer turns ratio and RMS currents that you can use to design your own transformer or get a magnetic house like Wurth or GCI to design the transformer for you.  It you need more information on designing mag-inc has application notes on how to design transformers.  The following link will get you to these application notes.  www.mag-inc.com/.../Technical-Documents

    I reviewed the reference design library and found a LLC step down converter (390V) to a  regulated  24V 10 A output.  https://www.ti.com/tool/PMP40281#descriptionArea  The benefit of  LLC is that it zero voltage switching for higher efficiency.

    It is recommended that the you use a PFC front end to regulate the input voltage.

    If you decide to do use the PMP40281 using the ucc256501 and have further questions regarding this devices operation.  Could you repost with this part number in the thread title so the appropriate applications engineer can support your question.

    I also would recommend using the new LLC controllers the ucc256402/3/4 for your  LLC design as well.  The following link will get to the product page for this device where you can find application notes and the Webench design tool, that can also be used to design.  Just scroll down or do a search on this page for Webench enter your design parameters and the tool will generate a schematic and BOM for your design.

    https://www.ti.com/product/UCC256402?keyMatch=UCC256402&tisearch=Search-EN-everything&usecase=GPN

    Regards,