LM5143A-Q1: Question on LM5143A-Q1 4-Phase Synchronous Buck Converter Load Ripple

Part Number: LM5143A-Q1

Tool/software:

We are using the LM5143A-Q1 to build a 4-phase synchronous buck converter. During testing with 30 V input voltage, 15 A input current, and 15 V output voltage, we applied a 5 A load using an electronic load. We observed that the output current has a ripple variation of about ±3 A.

Could you advise what might be the possible reasons for this behavior and how we can improve it?

Please find the schematic and quickstart design below.

7127.BUCK CONVERTER.pdf

LM(2)5143-Q1 quickstart design.pdf

Thank you for your support.

Best regards,

YUMING