LM27403: Not working simulation

Nikolai Alles

Part Number: LM27403

Tool/software:

Hello,

I am having trouble simulating a schematic of the LM27403. I used the Power Designer to calculate the schematic and built it, but the voltage at the output is 0V in my simulation. I have already checked the connections and tried to leave out the thermal connections, but it did not help. Also I do not understand what the UVLO/EN pin is for and if it needs to be used.

Can you please help me.

Best regards

4118.WBDesign7.pdf

4 months ago

0 Calan Elaya 4 months ago

TI__Genius 11435 points

Hello,

A response will be posted next week.

Thanks,

Calan

0 Ryan Chen 4 months ago

TI__Genius 15177 points

Hi Nikolai,

What are you using for simulation?

UVLO/EN is used if the user desires a specific UVLO power on input voltage level. It does not need to be connected if not used.

Best,

Ryan

0 Nikolai Alles 4 months ago in reply to Ryan Chen

Prodigy 20 points

Hello,

I am using LTSpice as simulation tool, but I was not able to get the simulation running. I already tried using and not using UVLO/EN, but it did not work both ways. I can not attach the simulation I am using to this message, but I do not understand why.

0 Ryan Chen 4 months ago in reply to Nikolai Alles

TI__Genius 15177 points

Hi Nikolai,

It looks like the SYNC pin should be connected to ground if not being used.

Best,

Ryan

0 Nikolai Alles 4 months ago in reply to Ryan Chen

Prodigy 20 points

Hello,

I tried but it still does not work. Do you have a working simulation?

Best regards

0 Ryan Chen 4 months ago in reply to Nikolai Alles

TI__Genius 15177 points

Hi Nikolia,

Do have you tried the PSpice simulation model that we have for this device? You can modify the component values from there to match your design.

Best,

Ryan

Power management

Power management forum

LM27403: Not working simulation