LM5035: Isolated 12V to 24V and 24V to 24V (10A out) with highest efficiency

Lukas Salzburger

Part Number: LM5035
Other Parts Discussed in Thread: LM5045

Tool/software:

We need to design a series of isolated converters with "12V" (down to 9V) or "24V" (up to 28.8V) input and 10A, 24V output. Which would be the most efficent TI solution? Cost and size are secondary concerns, I am looking for a peak efficiency >95% and a robust, long lasting solution even with elevated temperatures (40°C ambient and limited airflow).
Are the LM5035 or the LM5045 suitable or would there be a more efficient way?

3 months ago

+1 Hong Huang 3 months ago

TI__Guru 59895 points

Hi,

As your input voltage is below 13V so neither device you mentioned can power on to operate through HV pin. You can refer to each datasheet on HV pin to find how to make start when input voltage is lower than 13V,

I suggest to use LM5045 full bridge since your converter is 240W output power which will require large half bridge capacitor so LM5045 full bridge with MOSFETS can have smaller size.

0 Lukas Salzburger 3 months ago in reply to Hong Huang

Prodigy 90 points

Thanks!
so apart from the startup issue (external regulator requred) the LM5045 would be TIs most efficent solution or would you suggest an entirely different solution?

0 Hong Huang 3 months ago in reply to Lukas Salzburger

TI__Guru 59895 points

Hi,

Yes, LM5045 converter should be the most efficient solution. I do not have another solution better than this one.

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LM5035: Isolated 12V to 24V and 24V to 24V (10A out) with highest efficiency