TPS552892: [Delhi] [Winston] Schematic review

William Kao

Prodigy 200 points

Part Number: TPS552892

Tool/software:

Hi Experts

Please help review schematic for client requirement

thanks

Delhi-TI part power schematic_20250905.pdf

22 days ago

0 Shipeng Cheng 21 days ago

TI__Genius 17610 points

Hi William,

The capacitor in schematic don't show value, so I cannot review. Please let customer clarify this.

0 William Kao 21 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

Hi Shipeng

I know you're confused. let me show the capacitor value.

SC2D2U25V is 2.2uF_25V

SC10U25V is 10uF_25V

SC22U6D3 is 22uF_6.3V

SCD1U25V is 0.1uF_25V

SCD01U25V is 0.01uF_25V

SC47P50V is 47pF_50V

inductor 3D3UH is 3.3uH

0 Shipeng Cheng 21 days ago in reply to William Kao

TI__Genius 17610 points

Hi William,

Recommend add a100nF cap on EN pin.

VCC cap needs to be connected to PGND. And place PGB701 near VCC cap to connect to AGND.

I don't check compensation value because I don't know output cap part number and ESR. Other thing is OK.

0 William Kao 21 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

Hi Shipeng

Thanks for your review. each 33uF capacitor has an ESR 90mohm.

0 Shipeng Cheng 21 days ago in reply to William Kao

TI__Genius 17610 points

Hi William,

PRB715 needs change to 10k. Thanks.

0 William Kao 21 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

Hi Shipeng

Thank you for your prompt reply. the schematic is drawing based on their predecessor production project. could you share your calculation tool result to me. I might need explanation why we'd change the resistor.

thanks

+1 Shipeng Cheng 21 days ago in reply to William Kao

TI__Genius 17610 points

Hi William,

We have talked on Webex so I close this thread.

0 William Kao 21 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

thank you very much

0 Shipeng Cheng 21 days ago in reply to William Kao

TI__Genius 17610 points

Thanks.

0 William Kao 18 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

Hi Shipeng

please help to review the layout. thank you

Board file please download in below link.

https://fs.wistron.com/?ShareToken=2D71C6D45EDDF331A0C721801223ECD4613320C4

Password: 0908

+1 Shipeng Cheng 17 days ago in reply to William Kao

TI__Genius 17610 points

Hi William,

Please see my comments below.

1. Move the RC snubber to the inductor's right side, and move boot cap to connect to BOOT1/BOOT2 on bottom layer directly. Then inductor can be moved closer to IC.

2. Add three vias beside VIN pin and VOUT pin under the IC. See TI's EVM as example.

3. Add some vias near input cap and output cap. Then use layer10(other layer is also OK) to connect the vias at cap side to the vias under IC. So there's two layer copper for input and output.

4. VCC cap PCB717 should be placed closer to VCC pin, not EXTVCC pin. This is highest priority than other components connected to VCC pin.

5. Make PGB701 to near PCB717 to connect AGND and PGND.

6. Wire connect to PRB705 should be "Kelvin connection".

+1 William Kao 17 days ago in reply to Shipeng Cheng

TI__Prodigy 200 points

Hi Shipeng

thanks for your review~

Power management

Power management forum

TPS552892: [Delhi] [Winston] Schematic review