WEBENCH® Tools/TPS54821: Can I check compensation after editing schematic in Webench?

Scott Sansom

Part Number: TPS54821
Other Parts Discussed in Thread: TINA-TI, , TPS40428

Tool/software: WEBENCH® Design Tools

I added a phase boost cap by editing the schematic of a power supply in Webench. I now see that I no longer have the "Re-Comp" button available. I'd like to go see what my addition did to the gain and phase margin but I don't see how to do it.

over 7 years ago

0 JohnTucker over 7 years ago

TI__Guru**** 191445 points

Do you mean a feed forward capacitor in parallel with the upper FB resistor? I doubt WB will support that. Pspice or TINA-TI average model is your best option if you want to check the compensation for feed forward capacitors or mixed dielectric output capacitors.

0 Scott Sansom over 7 years ago in reply to JohnTucker

Prodigy 70 points

Yes, my phase boost cap is in parallel with the upper feedback resistor.

In my mind it's more of a generic question. It appears that whenever edit any schematic and add components to it (any component in any position) that I lose the ability to use the Re-Comp tool.

Is that right?

0 JohnTucker over 7 years ago in reply to Scott Sansom

TI__Guru**** 191445 points

That is what I think. It only works for the basic schematic. I'll move the post to the Webench forum to get their take on it. But I am pretty certain I am correct.

0 Wanda Garrett - WEBENCH Design Center over 7 years ago in reply to JohnTucker

TI__Intellectual 2360 points

Yes, John has it right. The full operating value calculations are only available when the schematic is produced by WEBENCH Power Designer. Once the schematic is brought into the editing environment, the calculations are no longer valid. Online simulation is still available, set up for Transient, and you can adjust it so you can see how load transient response is affected by schematic/design changes. If you want to do further analysis, best bet is to export it into TINA-TI or a PSPICE tool, and set up the Bode plot test.

0 Scott Sansom over 7 years ago in reply to Wanda Garrett - WEBENCH Design Center

Prodigy 70 points

So there is an automated way to export from Webench to TINA? That would be great as I've just started doing it by hand now.

0 Mahavir Jain over 7 years ago in reply to Scott Sansom

TI__Intellectual 2405 points

Hi Scott,

We have enabled Sim Export feature for the TPS54821 model in WEBENCH. Now you can create design in WEBENCH using TPS54821, modify it as per your application and check for OpVals and Simulation results and later can export it to the tool of your preference. Please find information to Export design from WEBENCH to TINA-TI and other tools at below link location:

www.ti.com/.../slvmay6a.pdf

Kindly let us know if you face any issues.

Thanks!!

Best Regards,

0 Scott Sansom over 7 years ago in reply to Mahavir Jain

Prodigy 70 points

Excellent! Thanks!

I have one more supply that I need to export to TINA - TPS40428 with CSD95378 driver chips.

Any chance that export might be enabled on that anytime soon?

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WEBENCH® Tools/TPS54821: Can I check compensation after editing schematic in Webench?