LM25088MH-2EVAL: I designed a power supply with WEBENCH®︎ Power Designer, but it has no output

Hi,

Can you also please share the layout that you designed for use with this part as well? Doing a full review will help us determine where the concerns may be.

Thank you,

Joshua Austria

portable20250725.brd

Hi Chime,

Are you able to possibly able to send screenshots of the layout layers?

I usually have trouble opening files in that program on my machine. 

Thank you,

Joshua Austria

组合 1.pdf

thank you

Hi,

It looks like your output is connected directly to ground. I am not sure why webench recommended that the output side of the inductor be connected to ground, but that is not a recommended connection to make for this device.

Can you please share your webench design that you used to generate that schematic?

Thank you,

Joshua Austria

Hello!  My first posted 2451.SCH is the schematic designed from WEBENCH. The output is grounded in order to output negative pressure.

Thank you!

Hi Chime, 

Understood. However, do you have a link to the webench design that you can share? 

On any webench model, you are able to create a shareable link by clicking the three dots in the upper right hand corner as shown in the screenshot below:

Thank you,

Joshua Austria

input 5.4v OUTPUT:-30/0.3A, dc/dc   webench.ti.com/.../SDP.cgi

Hi Chime,

The link sent looks to be broken. Are you able to send a new one?

Thank you,

Joshua Austria

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=FC407E0486882543

Hi Chime,

Thank you for sharing the webench. I am noting that I see a couple differences between your schematic and the one recommended by webench. 

• Rsense should be 40mOhm. Your circuit has 25mOhms for Rsense.
• L1 should be 15uH. Your circuit has 8.2uH
• R97 does not exist on the webench schematic
• The compensation network values look to be off of what is recommended by webench
• CRAMP should be 180pF instead of 100pF
• Your output and input capacitors seem to be over the recommended webench values as well.

When you make all the changes as listed above, does the device function properly?

Thank you,

Joshua Austria