about TPS 5430

kim jeoinh hun

Prodigy 50 points

Other Parts Discussed in Thread: TPS5430

Dear sir

I am using TPS5430 for 7" Monitor with four camera. the operating condtion is as follow

Vin min =12V

Vinmax=30V

Vout=9.5V

I out max=1.5A

but, when enter 17 V input voltage into out product, I can see noise on monitor screen with gray color

and then, we can't see the same noise on monitor screen with the same conditon except 16~18V input voltage

Please tell me how to solve this problem as soon as possible,

Best regards

J.H.Kim

over 14 years ago

0 JohnTucker over 14 years ago

TI__Guru**** 191445 points

Can you provide waveforms and schematics? I am currently out of the office for the holidays, but may be able to answer your question if there is something obvious in the schematic or waveforms.

0 kim jeoinh hun over 14 years ago in reply to JohnTucker

Prodigy 50 points

1234.CJ-7300-MAIN_REV_05_SCH_전원회로.pdfDear John

I send my schematic to you. after you review it, if you find some problem, Please let me know

Best regards

J.H.Kim

0 kim jeoinh hun over 14 years ago in reply to kim jeoinh hun

Prodigy 50 points

Dear John

How are you?.

I have not received any response from you until now. Please send the response to me As soon as possible

Best regards

J.H.Kim

0 JohnTucker over 14 years ago in reply to kim jeoinh hun

TI__Guru**** 191445 points

I do not see any schematic or waveforms posted. Can you try again?

0 kim jeoinh hun over 14 years ago in reply to JohnTucker

Prodigy 50 points

Dear John

I send the schematic to you again. I want to connect TWO TPS5430 serially. that is , the output of TPS5430 connect to input of next TPS5430

but, the switching frequency of the first TPS5430 made the noise on 7inch monitor screen with gray color

Please let me know how to solve this problem. I do not have enough time. I need your help as soon as possible,

Best regards

6864.CJ-7300-MAIN_REV_05_SCH_전원회로.pdf

0 JohnTucker over 14 years ago in reply to kim jeoinh hun

TI__Guru**** 191445 points

I don't see anything that jumops out at me. I do notice that you are using some sort of electrolytic output cpacitors on both outputs. The first converter uses additional feedback components for compensation. They are identical to those in the application note:

http://www.ti.com/litv/pdf/slva237c

But the design may not be teh same. Did you actually do the calaculations or just copy the values? I recommend that you go thru the design procedure outlined in the application note for both supplies. Let me know how that works and we can continue from there.

Power management

Power management forum

about TPS 5430