PTH08T230W: PTH08T230WAD

VENKATESWARARAO M

Part Number: PTH08T230W

AS WE PURCHASED THIS PART WITH WITH ORDER NO T02165987 WE PURCHASED AROUND 62 NOS WE HAVE ASSEMBLED THIS PART INTO SOME OTHER BOARDS WE OBSERVED THAT IN SOME BOARDS THERE IS A NOISE LIKE SOUND IT IS ONLY FOR SOME MODULES NOT FOR ALL WE OBSERVED THAT WE ARE GETTING IT FROM INDUCT OR WHICH IS PRESENT ON POWER MODULE WHICH IS BEEN SUPPIED BY YOU WE WANT TO KNOW THAT WHY THE SOUND IS BEEN OBSERVED THAT TO ONLY IN SOME BOARDS WHY NOT IN ALL BOARDS WHEN WE OBSERVED THE SOUND IN THE BOARD THEN WHEN YOU PHYSICALLY TOUCHES THE BOARD THE SOUND IS GETTING MINIMAL AND LATER WHEN WE REMOVE OUR HAND AGAIN THE SOUND GETS STARTED OUR END CUSTOMER IS NOT ACCEPTING THIS SOUND THEY ARE ASKING THE TECHNICAL WRITE UP REGARDING THIS ISSUE DUE TO WHICH OUR ENTIRE BOARDS ARE STUCK ON PRIORITY PLEASE LOOK INTO THIS GET US THE SOLUTION FOR US

over 2 years ago

0 Yitzhak Bolurian over 2 years ago

TI__Mastermind 18370 points

Hi,

Does this happen at all loads?
Meaning at all output currents, or only at high or low output current?

Regards,

Yitzhak Bolurian

0 Yitzhak Bolurian over 2 years ago

TI__Mastermind 18370 points

Hi again,

Generally audible noise can be triggered by one of the following:

1) Instability
2) Light load pulse skipping (Does not happen in specific case of PTH08T230W)
3) Hiccup due to overcurrent
4) Pulsating load current at frequencies below 20 KHz

Can you provide the schematic of your connection/board?

Can you check a noisy one, when disconnected from the load and connected to a stable load (Power resistor or Electronic load) and see if noise persists?

Regards,
Yitzhak

0 VENKATESWARARAO M over 2 years ago in reply to Yitzhak Bolurian

Prodigy 10 points

cib.pdf

0 Yitzhak Bolurian over 2 years ago in reply to VENKATESWARARAO M

TI__Mastermind 18370 points

Hi,

I have reviewed your schematic and it looks fine.

Can you check a noisy one, when disconnected from the load and connected to a stable load (Power resistor or Electronic load) and see if the noise persists?

We may need to review your PCB layout as well.

Regards,

Yitzhak

0 VENKATESWARARAO M over 2 years ago in reply to Yitzhak Bolurian

Prodigy 10 points

Dear Sir,

We have disconnected it from circuit and still the noise sound is still continue to be same

0 Yitzhak Bolurian over 2 years ago in reply to VENKATESWARARAO M

TI__Mastermind 18370 points

Hi,

So, the output current is zero now? Or you have connected the output to an alternative load?

Do you hear the noise at both high and low output currents? Please advise.

could you please share the PCB layout with us as well?

Regards,

Yitzhak

0 Yitzhak Bolurian over 2 years ago in reply to Yitzhak Bolurian

TI__Mastermind 18370 points

Hi again,

Have you had the chance to look into this further?

Regards,

Yitzhak Bolurian

0 VENKATESWARARAO M over 2 years ago in reply to Yitzhak Bolurian

Prodigy 10 points

the noise remains same when the load is low and high we have replaced the module with the new module in the same PCB which are having problem then with the new module there is no sound at all

0 Yitzhak Bolurian over 2 years ago in reply to VENKATESWARARAO M

TI__Mastermind 18370 points

Hi,

Thank you for your feedback.

If the module makes noises at all loads, then we seem to have a stability issue.

A single 220 uF ceramic capacitor may not be enough for a good stability.

This is specially through for the higher Vout rails, since the ceramic capacitors derate at higher voltages.

Could you please provide us with the part numbers for both the 220uF ceramic capacitor and the 330 uF electrolytic capacitor at the output?

Alternatively we need to know the ESR and voltage rating of the caps, but knowing the part number is preferable.

I see that you use more than one of these modules on your board. Does this issue always happen at certain rail/location/output voltage?

Meanwhile, you could also change the Rtt (R210, R214, R216) resistor to 8.2KOhms and add a 100 uF ceramic capacitor in parallel with the output caps and see if the issue goes away.

Regards,

Yitzhak Bolurian

0 Yitzhak Bolurian over 1 year ago in reply to VENKATESWARARAO M

TI__Mastermind 18370 points

Hi,

Have you had the chance to look at this further?
And follow our recommendations?

Thanks and regards,

Yitzhak

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PTH08T230W: PTH08T230WAD