Schematic review: TPS53355; TPS51206; TPS54320RHLR; TPS73701DRVR

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Posted by tung ngo

on Jul 11 2012 04:31 AM

Prodigy210 points

TPSxx_Power.pdf

Dear,

I'm Tung Ngo from Applied Micro, We're designing new project that using TI regulator parts.

Could you please help reviewing schematic attachment. Please focus on Thermal and EMI too.

Thanks

Tung

All Replies

Posted by tung ngo

on Jul 23 2012 03:45 AM

Prodigy210 points

Dear,

Can anyone help us review this schematic?

Thanks

Tung

Posted by JohnTucker

on Jul 23 2012 06:57 AM

Guru50135 points

I took a quick look at the TPS54320 schematics. You did not supply any design equations, so I only looked for obvious errors or component values that are much lower or higher than typical. I do notice that your 5 V, 3A supply has only 2 x 22 uF of output capacitance. The supply will regulate with that, but transient performance may not be optimal.

John Tucker

Consumer DC/DC Applications

Posted by Nancy Zhang (CPM)

on Jul 23 2012 08:06 AM

Verified Answer

Verified by Nancy Zhang (CPM)

Mastermind26680 points

Hi Tung,

I review the schematics for TPS53355 and TPS51206. Here is my comments:

TPS53355: 1. Change R57 from 100k to 147k to set current limit 34A. 2. Change R54 from 34k to 18.7k to set around 10mV ripple voltage at feedback pin to stabilize the loop. 3. Change R? snubber resistor from 0402 package to 0805 package. Please refer to attached spreadsheet for detail component calculation.

TPS51206: Change C? 0.1uF from pin5 (VTTSNS) of U4, U5, U? to non-populated. Please refer to TPS51206EVM user's guide.

7455.TPS53355 Design Spreadsheet1.35V30A .xls

Thanks,

Nancy

Posted by tung ngo

on Jul 24 2012 05:12 AM

Prodigy210 points

TPS54320RHLR_Power.pdf

Hi John Tucker,

I do not understand your meaning "You did not supply any design equations".

Our CPU accept voltage ripple less than 5%. Could you please help review again.

Thanks

Tung

Posted by tung ngo

on Jul 24 2012 05:16 AM

Verified Answer

Verified by tung ngo

Prodigy210 points

TPS53355DQPT_Power.pdf

Hi Nancy,

Thanks you very much for your comment. I've just updated schematic, could you please help review again.

Note: I changed voltage output from 1.35V/30A to 1.5V/30A

Thanks

Tung

Posted by JohnTucker

on Jul 24 2012 07:06 AM

Guru50135 points

How did you determine the component values? I'm sure you used some equations. If you provide those I will check them. Otherwise the schematic review is a "visual inspection" to look for obvious errors.

John Tucker

Consumer DC/DC Applications

Posted by tung ngo

on Jul 24 2012 07:18 AM

Prodigy210 points

Hi John Tucker,

I used SwitcherPro Desktop.

Thanks

Tung

Posted by tung ngo

on Aug 09 2012 02:03 AM

Prodigy210 points

Hi John Tucker,

Did you take time to review my schematic?. We're going to build some prototype boards, please help!

Thanks

Tung

Posted by tung ngo

on Aug 09 2012 02:07 AM

Prodigy210 points

Hi Nancy,

Could you please review my schematic? We're going to build some prototype boards next week.

Thanks

Tung

Posted by JohnTucker

on Aug 09 2012 06:44 AM

Guru50135 points

I did look at that schematic previously and provided my comments. The TPS54320 is not a part that I directly support, but sometimes I will comment on general topics if I know about them. usually, it is best to contact your local AFA or FAE to get schematic reviews.

John Tucker

Consumer DC/DC Applications

Posted by Nancy Zhang (CPM)

on Aug 09 2012 15:30 PM

Verified Answer

Verified by Nancy Zhang (CPM)

Mastermind26680 points

Hi Tung,

TPS53355 and TPS51206 schematic look good.

Thanks,

Nancy

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