TPS4811-Q1: TPS48111LQDGXRQ1 schematic review

Nam, Dino

Expert 6445 points

Part Number: TPS4811-Q1

Dear team,

My customer would like to use TPS48111 for their application.

- application : 48V/200A E-Relay with Pre-charge for battery system.

Please review below schematic and let me know your opinion

48V_200A_E-RELAY_230914_R00.pdf

Thank you.

over 2 years ago

0 Rakesh over 2 years ago

TI__Guru** 105611 points

Hi Dino,

Can you share filled up deign calculator for review. It is available under product folder.

Best Regards,

Rakesh

0 Nam, Dino over 2 years ago in reply to Rakesh

TI__Expert 6445 points

Hello Rakesh,

Thank you for your interest

Please refer to the below calculator and schematic. Please review below schematic and let me know your opinion.

- application : 48V/100A E-Relay with Pre-charge for battery system.

48V_100A_E-RELAY_230918_R00.pdf

TPS4811-Q1_Design_Calculator_RevB_LS.xlsm

Thank you.

+1 Rakesh over 2 years ago in reply to Nam, Dino

TI__Guru** 105611 points

Hi Dino,

please find my comments on design

1. CBST needs to be increased to 1.5uF as you have 8 FETS in parallel

CBST = Total Qg of all FETs / 1V

2. The common source point of back to back MOSFETs should be connected to SRC pin

3. Pre-charge resistor should come before the pre-charge FET and the source of pre-charge FET should be connected to SRC and ommon source point of back to back MOSFETs

4. Separate controller ground and system ground. connect them at single point. Please refer 10.5.1 Layout Guidelines in the data sheet

Best Regards,

Rakesh

0 Nam, Dino over 2 years ago in reply to Rakesh

TI__Expert 6445 points

Hi Rakesh,

Thank you for your strong support.

0 Nam, Dino over 2 years ago in reply to Nam, Dino

TI__Expert 6445 points

Hi Rakesh,

The customer revised their schematic as your recommendation.

48V_100A_E-RELAY_230921_R00.pdf

Please review it again and let me know your opinion.

Thank you.

+1 Rakesh over 2 years ago in reply to Nam, Dino

TI__Guru** 105611 points

Hi Dino,

The updated schematic looks good to me.

Best Regards,

Rakesh

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TPS4811-Q1: TPS48111LQDGXRQ1 schematic review