LM5143A-Q1: Using LM5143 for 48V to 12V, 35 Amps conversion

Hello Team, 

some additional information below, 

1. Input voltage range is 30V to 60V with 48V as typical. 

2. Output voltage required is 12V

3. Output current is 35 Amps

4. Output power is 420 Watts

5. Operating ambient temperature is -40° C to +125°C. 

1. Please suggest a suitable multi-phase buck convertor for this. 

2. Can this requirement achieve with two phase convertors? Or should i use 3phase convertor?

3.  LM5143A-Q1 - I read that the Sync-out is 90-degree phase shifted. How to configure this device to 3phase operation?

4. Is there any reference design available for 3 phase convertor that meets the above requirements?

Hello Selvaraj

Thank you for showing interest in TI's products

LM5137-Q1 would be a better choice for 48V application. You will find following resources quite helpful 

1. EVM user guide 12V, 20A - LM5137F-Q1 12V, 20A Single-Output Evaluation Module
2. QuickStart calculator - LM5137-LM25137-DESIGN-CALC Calculation tool | TI.com
3. How to Implement Four-Phase Interleaving Buck With LM5137F-Q1

You would be able to meet this requirement with 2 phases. However, 3/4 phase implementation would help achieve better thermal performance. I would highly encourage using QuickStart during design process.

Let me know if you have further queries

Thank you

Regards

Onkar Bhakare 

Hello Mr. Bhakare, 

Thanks for the feedback. 

I feel with two phase conversion it would be difficult to achieve the thermal performance. But if i use four phases, then it becomes costly. 

For me, 3phase convertor will be sweet spot for this requirement. Do you have information document on how to configure the LM5137F-Q1 for 3 phase conversation operation. 

Hello Mr. Bhakare, 

Thanks for the feedback. I will consider the part LM5137-Q1 will work on the design analysis. 

I am also looking for "Ideal diode/ORing controllers" for 48V input protection. I see a lot of options in the matrix: Ideal diode/ORing controllers product selection | TI.com.

Please suggest a suitable part for 30V to 60V input range and maximum of of 15Amps current. The main features required are reverse voltage protection, reversed current, Undervoltage, overvoltage. The part should withstand 70V load dump for short periods (i.e, the absolute maximum should be >70V).