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AC or DC input to DC output SMPS circuit design

Zaim
Prodigy 90 points
Other Parts Discussed in Thread: LM5021

Dear TI team

I want to design an SMPS circuit with the following specifications:

* Input can be either 33-265 VAC or 48-375 VDC (ultra-wide input)

* Multiple DC outputs

1.output : 24V with 0.7 A

2.output : +10V with 0.8 A

1.output : -10V with 0.8 A

1.output : 5V with 0.5 A

1.output : 3.3V with 1 A

* Output power (40-100W)

.

How to design an isolated  power supply circuit with the specifications above ?

How can I make the transformer calculations according to this circuit? Is there any softwares to do that ? Please guide us 

sincerely,

Zaim.

  • +1
    TI__Intellectual 1255 points

    Hello Zaim,

    Thanks for your interest and providing your specifications in your post.

    To design this isolated power supply circuit, I recommend you follow https://www.ti.com/tool/PMP30280 as a starting point. This design has 2 outputs, but it's close to your input specification and contains our LM5021.  This controller is a good fit for this application because it's a flyback controller that supports continuous conduction mode. Which should have better cross-regulation performance than controllers that support only discontinuous or transition/critical conduction mode flybacks.

    Optimizing this design to compensate for this many outputs will likely take some iteration.

    I'm not aware of a free, online, high performance software tool that will help you make transformer calculations for a 6 output supply. But, know you'll likely want 8 transformer windings in total (1 for each secondary side output + auxiliary bias + primary side). You can start your transformer design using the equations in section "8.2.2.2 Transformer" of the LM5021 datasheet with your transformer vendor. 

    Let me know if this helps, and if you need more help on this question for this project then please reply to this post.

    Regards,

    Andrew