LM5045: LM5045 Design Calculator

Hi Govind,

This is a MATHCAD spreadsheet file. MATHCAD is an engineering calculation software. It looks like you can download the free version of the software from the MATHCAD website: Mathcad Express Free Download | Mathcad.

Thanks,

Joseph

Thanks Joseph 

for your reply 

may I got 12V-14V / 30A output from LM5045.

means if i need 12v-14v/30a output may i use LM5045 for isolated dc dc converter 

Thanks

Govind

Hi Govind,

Yes, this device supports full-bridge, half-bridge, and push-pull topologies that are able to supply this amount of power to the output.

What is your input voltage? This device is rated up to 100V input.

Thanks,

Joseph

Hi Joseph

Thanks for your reply.

Sir  My question is not related with Ti Ic but I need help 

may you suggest me the transformer and Mosfet  for 14V/30A output by using LM5045. if possible send me the link of transformer and mosfet.

Thanks 

Govind 

Hi Govind,

In order to determine the necessary transformer and MOSFET, you will need to determine what power topology you want to use, namely the full bridge, half bridge, or push-pull. 

Also, can you share the the input voltage and any other design requirements you have?

Thanks,

Joseph

If not already done, please consider TI Power Stage Designer which is a free and easy to use design tool. You can determine the transformer parameters and voltage and current stress on the MOSFETs for most of the mainstream converter topologies. The information you can get from Power Stage Designer will help make it easy to select power stage components, work with magnetics vendors and even compensate your control loop. Hope this helps.

Regards,

Steve M

HI Joseph 

Thanks for your reply . I was not available from 10 days 

I want to use full bridge topology 

my input voltage range is : 36v-100v 

output should be 13.5 ± 0.5v and current should be 30A

for isolated dc -dc converter . please suggest the transformer and MOSFETS

Please give me reply its necessary for me . I am stuck in this situation. 

Hi Govind,

You can refer to this LM5045 reference design to see an example of the magnetics and MOSFETS used. However, it would be best to check with the magnetics vendor directly for transformer recommendations. 

For selecting the MOSFETS you will need to consider the RMS, and PK currents, as well as the voltage rating to ensure they have enough margin to withstand the operating current and voltage.

TI MOSFETs are rated up to 100V for N-channel so there will not be enough margin for your 100V input range. You can also check Power Stage Designer as Steve mentioned above to understand the specifications needed for the transformer and MOSFET.

Thanks,

Joseph

Dear Joseph 

Thanks for your reply 

for isolated dc -dc converter 

 input voltage range is : 36v-100v 

output should be 13.5 ± 0.5v and current should be 30A

can you suggest me any dc -dc converter module which fulfilled my above mentioned requirement. 

Thanks in advance

Govind

okay i will try