LM61495: LM61495RPHR

Timo Michel

Part Number: LM61495

Tool/software:

Hello everyone, I would need your help. 
Please take a look at the circuit shematic. 
I can't find the error right now. 

My output voltage is 1.2V. 

But it should be 5V fixed.

Thank you for the help :-)

6 days ago

0 Timo Michel 5 days ago

Prodigy 10 points

Sorry i forgot VIN= 12V

0 Marshall_Beck 5 days ago in reply to Timo Michel

TI__Mastermind 34790 points

Hi Timo, sorry to hear about the issue.

It maybe related to the stability of the converter.

What is the voltage rating and case size of the output capacitance?

I would advise they capacitors be rated 16V.

Could you try increasing the voltage rating on the output capacitors to avoid them derating and possibly increasing the count if you are still running into issues?

0 Timo Michel 5 days ago in reply to Marshall_Beck

Prodigy 10 points

Hi Marshall, many thanks.

My vin is 12-13.9V

I think my issue its by R1 the Rreset. Its 18ohm.

Wgat do you think?

What is the best R for Rreset.

Many thanks

0 Marshall_Beck 5 days ago in reply to Timo Michel

TI__Mastermind 34790 points

Hi Timo,

I think it is the output capacitance and I would suggest evaluating the changes I gave to confirm that hypothesis.

For Rrset 18ohm is on the low side and could result in a large sink current. I would change it to 10kOhm or above.

0 Timo Michel 4 days ago in reply to Marshall_Beck

Prodigy 10 points

Hello Marshall,

I have size 1206 10V 47uf on the output side tested .

Currently I have 6 parallel ones, unfortunately still without improvement.

I will now try to test 16V capacitors, I hope that it is still there as you wrote.

0 Andrew Kutzler 59 minutes ago in reply to Timo Michel

TI__Genius 15440 points

Hi,

Marshall is out of office today and will return to provide a response to this tomorrow.

Thanks,
Andrew

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LM61495: LM61495RPHR