LM5041: LM5041 loop calculation

Arabella Zhang

Part Number: LM5041

Tool/software:

Dears,

My Customer, Sifang, is a very important railway customer. Now the customer chooses LM5041 for railway transportation projects. The attached is the LM5041 BUCK cascade push-pull topology circuit diagram. How to perform loop calculation in this topology?

Many thanks!

Arabella Zhang

over 1 year ago

0 Steven Mappus1 over 1 year ago

TI__Mastermind 33135 points

Try AC modelling with TINA models provided in the LM5041 product folder
Try downloading and using TI Power Stage Designer and recommend to try the control loop modelling tool

Regards,

Steve

0 Arabella Zhang over 1 year ago in reply to Steven Mappus1

TI__Expert 4360 points

The LM5041 BUCK cascade push-pull topology is not available in TI Power Stage Designer. TI Power Stage Designer cannot determine the control loop parameters of the LM5041 BUCK cascade push-pull topology. Is there any other way to determine the control loop parameters of the LM5041 BUCK cascade push-pull topology?

Thanks,

Arabella

0 Hong Huang over 1 year ago in reply to Arabella Zhang

TI__Guru 74075 points

Hi,

You can do in this way:

- Assuming the push-pull work in 100% duty cycle so you can refer all secondary side capacitors and loads to the primary side. Then the transformer is eliminated and you obtain a typical buck.

- Use typical buck design procedure to design its phase and gain margin.

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LM5041: LM5041 loop calculation