WEBENCH® Tools/LMZ20502: LMZ20502

Don Carolan38

Part Number: LMZ20502

Tool/software: WEBENCH® Design Tools

Using Webbench my 5V to 3.3Vdc circuit puts out 4.1V. The resistor values suggested Rfbt= 232K in parallel with 12pf and Rfbb= 51.7K

What causes this error? Is there a minimum load for this part? There is 22uF on the output and it is lightly loaded. The mode pin is grounded.

over 4 years ago

0 Amod Vaze over 4 years ago

TI__Mastermind 21755 points

Hi Don,

Can you please share your WEBENCH design with us? Please see screenshot for reference. We can take a look at the design further and also request product expert help if required regarding operation of the device.

Regards,

Amod

0 Don Carolan38 over 4 years ago

Prodigy 40 points

Sure thing. Here you go.

webench.ti.com/.../SDP.cgi

0 Don Carolan38 over 4 years ago in reply to Amod Vaze

Prodigy 40 points

It is better behaved with a 220 Ohm load. 3.65V under load

0 Amod Vaze over 4 years ago in reply to Don Carolan38

TI__Mastermind 21755 points

Don,

The simulation ran fine and converged to correct values inside the WEBENCH tool so I assume you are having issues on an actual board when testing. Please confirm if that is correct. If that is correct, would it be possible for you to share your actual design BOM, schematic and PCB layout files so a product expert can review them?

Regards,

Amod

0 Jimmy Hua over 4 years ago in reply to Amod Vaze

TI__Mastermind 47060 points

Hi Don,

Was Amod able to answer your question about the convergence of the WEBENCH design? I want to confirm that you are not having any further issues with this simulation before I close this thread.

Regards,

Jimmy

0 Jimmy Hua over 4 years ago in reply to Jimmy Hua

TI__Mastermind 47060 points

Hi Don,

I have marked Amod's answer as the resolution to your problem. We have not heard back from you so I assumed you have resolved the issue on your end. If you have any further questions, please reply back to this post and it will reopen for further discussion.

Regards,

Jimmy

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WEBENCH® Tools/LMZ20502: LMZ20502