TPS543B20: TPS543B20RVFT (1V35) Layout Verification

Nachiketh Karanth

Intellectual 550 points

Part Number: TPS543B20

Hi,

Please verify the attached layout for TPS543B20RVFT, Vin-12V, Vout-1.35V. Schematics is attached for reference.

Thanks

/cfs-file/__key/communityserver-discussions-components-files/196/TPS543B20RVFT_2D00_1V35_5F00_1.pdf

/cfs-file/__key/communityserver-discussions-components-files/196/TPS543B20RVFT_2D00_1V35.brd

over 1 year ago

0 Calan Elaya over 1 year ago

TI__Expert 7795 points

Hello,

Britton will respond to this after the holidays.

Thanks,

Calan

0 Britton Jones over 1 year ago in reply to Calan Elaya

TI__Expert 7136 points

Hello,

Is this design intended for 50A total load current? If so, the 63.4kOhm ILIM setting is not large enough to support 25A on each phase. I recommend something closer to a 76kOhm ILIM resistor.

I also recommend including a unpopulated placeholder for a feedforward capacitor and resistor in parallel with the top resistor in the feedback divider. This may not be required for stability but is worthwhile to include as a precautionary measure.

For the layout, please ensure there is a short trace that connects the AGND pin to the thermal pad. This should be the only connection between AGND and PGND.

Best regards,

Britton

0 Nachiketh Karanth over 1 year ago in reply to Britton Jones

Intellectual 550 points

Hi Britton,

Please explain why 63.4K ohm is not large enough?

Thanks

0 Britton Jones over 1 year ago in reply to Nachiketh Karanth

TI__Expert 7136 points

Hello Nachiketh,

My apologies for the confusion. 63.4kOhm is okay for this application (ILIM is approximately 27A). I had accidentally used a 100nH inductor in my calculations instead of 180nH. I have updated your accompanying thread as well to reflect this.

Best regards,

Britton

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TPS543B20: TPS543B20RVFT (1V35) Layout Verification