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LM5155: Increasing the current capability of LM5155EVM-SEPIC design to 5A

Part Number: LM5155
Other Parts Discussed in Thread: , LM5176


I have modified a LM5155EVM-SEPIC evaluation module to 5V output voltage by changing R9 (Rfbt) to 18.7 kOhm and that works just fine with up to 2A output current with an input voltage between 3.6 and 36V.

But in my application we need 5A output current, so my question is what other changes I will need to make to the schematic to achieve the following specifications:

Input voltage: 3.6 to 36V

Output voltage: 5V

Output current: 0 to 5A 

Input current: 0 to 5A, since the input current is also limited to 5A the maximum output current will not be 5A all the way down to 3.6V,

Ambient temperature: The board will be mounted inside a box with no air flow and the temperature inside the box is estimated to be up to about 83C and down do -40C.

The building height should be kept below 4mm where possible, and the absolute max building height is 8 mm.

If You could help with the needed changes and possible added components, it would be big help.

Best regards