Webench LM53603-Q1 in FPWM Mode

Shinichi Yokota

Other Parts Discussed in Thread: TINA-TI

Hello,

I'd like to perform simulation of LM536035-Q1 in FPWM mode on the Webench, but it seems that only AUTO mode is available currently. How can I perform the simulation in FPWM mode?

Best regards,
Shinichi Yokota

over 8 years ago

0 Nikhil Gupta (Product Folder Models) over 8 years ago

TI__Mastermind 39210 points

Yokota-san,

Just to clarify, by simulation are you referring to spice simulations?

0 Shinichi Yokota over 8 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Genius 9715 points

Gupta-san,

No, what I refer to is Webench. When I choose the device LM536035-Q1, the schematic shows AUTO mode because its FPWM pin is tied to GND. But if I could edit the schematic, I wonder whether I might be able to change the connection of the FPWM pin, but actually the EDIT button on the Webench won't work. That's the issue.

Best regards,
Shinichi Yokota

0 Nikhil Gupta (Product Folder Models) over 8 years ago in reply to Shinichi Yokota

TI__Mastermind 39210 points

Yokota-san,

The Startup sim for this device was originally disabled on WEBENCH as it was taking a long time to run. Hence Edit functionality is also disabled. We will see if

(1) We can enable the Startup sim OR
(2) Enable Sim Export from WEBENCH to TINA-TI for offline editing.

0 Shinichi Yokota over 8 years ago in reply to Nikhil Gupta (Product Folder Models)

TI__Genius 9715 points

Gupta-san,

What I'd like to get through Webench is an efficiency curve - efficiency vs. output current in FPWM mode.

Best regards,
Shinichi Yokota

0 Nikhil Gupta (Product Folder Models) over 8 years ago in reply to Shinichi Yokota

TI__Mastermind 39210 points

Hi Yokota-san,

The edit button that you showed in the previous image was for online spice simulation only.It should not be used if you are interested in Efficiency calculations in a different regime.

For this device, we do not have the FPWM option available in WEBENCH (the part still supports this, it is just a tool limitation), and also it is not modeled in the efficiency calculations. Only the CCM/PFM efficiency is modeled.

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Webench LM53603-Q1 in FPWM Mode