LM5170EVM-BIDIR: Buck mode inductor current sensing

Gaureej Gauttam

Part Number: LM5170EVM-BIDIR

I am using LM5170EVM-BIDIR as a controlled buck converter, and I am looking for a way to sense the inductor current. Could you please suggest any methods or approaches for sensing the inductor current?

Regards,

Gaureej

4 months ago

0 Feng Ji 4 months ago

TI__Expert 8985 points

Hi Gaureej,

You may sense inductor current with IOUT1 and IOUT2 with below method.

You may remove C_IOUT1 and C_IOUT2 for higher bandwidth.

Best Regards,

Feng Ji

0 Gaureej Gauttam 4 months ago in reply to Feng Ji

Prodigy 30 points

Thanks Feng Ji,

Could you please elaborate a bit on how to use the Iout1 and Iout2 as per the diagram shared?

Could you please provide me with the steps to measure the inductor current using this method?

Thanks,

Gaureej

0 Feng Ji 4 months ago in reply to Gaureej Gauttam

TI__Expert 8985 points

Hi Gaureej,

As described in datasheet 8.3.6 Channel Current Monitor (IOUT1, IOUT2), IOUT1 is a current source that is proportional to Vcs.

Please read LM5170EVM-BIDIR user guide.

You may measure IOUT1 signal at J2.

Best Regards,

Feng Ji

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LM5170EVM-BIDIR: Buck mode inductor current sensing