TPS53353: Schematic Review

Kuan Wei Chen (Kevin Chen)

Genius 9710 points

Part Number: TPS53353

Dear Team,

Customer and I just using the Webench to finish the below power rail design.

Can you check if you have further comments?

Kevin

over 5 years ago

0 Gerold Dhanabalan - Online Design Tools over 5 years ago

TI__Genius 14455 points

Hi Kuan,

Can you please share the WEBENCH designs for the above?

regards,

Gerold

0 Kuan Wei Chen (Kevin Chen) over 5 years ago in reply to Gerold Dhanabalan - Online Design Tools

TI__Genius 9710 points

Dear Gerold,

0.8V:

https://webench.ti.com/power-designer/switching-regulator/customize/114?AppType=None&O1I=17.1&O1V=0.8&VinMax=12&VinMin=12&base_pn=TPS53353&lang_chosen=en_US&op_TA=30&optfactor=3&origin=ti_search&refpage=https:%2F%2Fwww.ti.com%2Fsitesearch%2Fdocs%2Funiversalsearch.tsp

1.88V:

https://webench.ti.com/power-designer/switching-regulator/customize/115?AppType=None&O1I=15.4&O1V=1.88&VinMax=12&VinMin=12&base_pn=TPS53353&lang_chosen=en_US&op_TA=30&optfactor=3&origin=ti_search&refpage=https:%2F%2Fwww.ti.com%2Fsitesearch%2Fdocs%2Funiversalsearch.tsp

3.3V:

https://webench.ti.com/power-designer/switching-regulator/customize/116?AppType=None&O1I=14&O1V=3.3&VinMax=12&VinMin=12&base_pn=TPS53353&lang_chosen=en_US&op_TA=30&optfactor=3&origin=ti_search&refpage=https:%2F%2Fwww.ti.com%2Fsitesearch%2Fdocs%2Funiversalsearch.tsp

1V；

https://webench.ti.com/power-designer/switching-regulator/customize/117?AppType=None&O1I=10.5&O1V=1&VinMax=12&VinMin=12&base_pn=TPS53353&lang_chosen=en_US&op_TA=30&optfactor=3&origin=ti_search&refpage=https:%2F%2Fwww.ti.com%2Fsitesearch%2Fdocs%2Funiversalsearch.tsp

0 Gerold Dhanabalan - Online Design Tools over 5 years ago in reply to Kuan Wei Chen (Kevin Chen)

TI__Genius 14455 points

Hi Kuan,

There is something wrong with the links that you sent. Can you please go to the WEBENCH design and click on the three dots on the top right. There will be a link called Share Design. Inside that there should be a tab for Public Link. Click on the "Get Link" and copy and paste that link. The link that you sent me is not opening correctly.

Regards,

Gerold

0 Kuan Wei Chen (Kevin Chen) over 5 years ago in reply to Gerold Dhanabalan - Online Design Tools

TI__Genius 9710 points

Dear Gerold,

0.8V:

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=C5AC923AE3A37402

1.88V:

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=C5AC923AE3A37402

3.3V:

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=6A79A7D3342D08E4

1V:

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=51B6BC8D2E41AA2F

0 Peter James Miller over 5 years ago

TI__Guru 53255 points

Kevin,

I see a couple of concerns that should be checked.

1) They did not follow the WeBench CIN configurations and they have large, high ESR electrolytic capacitors with fewer and smaller ceramic input capacitors. It is likely that those Cin configurations are over-stressing the RMS ripple current capabilities for both the ceramic and the electrolytic capacitors.

2) All 4 schematics show EN tied to ground with a 4.7-kOhm resistor.

3) With the RCC injection scheme, the absolute resistance at the feedback pin and the AC coupling capacitor sizing from the RCC injector is critical, they can not scale the feedback resistors to lower feedback resistance and leave the RCC injection circuits unchanged.

Note: the attached file for the 1.88V rail below is the same files as the 0.8V rail, which is for the 0.8V converter and not the 1.88V converter.

4) The RCC injection circuits in the attached schematics don't match the WeBench designs either. The RCC injection network is a critical part of the compensation of the loop with all ceramic output capacitors.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

Power management

Power management forum

TPS53353: Schematic Review