LMR33630: Simulation through PSpice model in LTSpice Results in 0V at output.

Manish Poojary

Part Number: LMR33630

Hello TI Team,

I am using the Transient PSpice model provided in TI website for LMR33630A. I have an input of 12VDC and I want output of 5VDC at output.

I have designed the circuit as per requirement but when I simulate it in LTSpice I get a Transient of 12V at output and post that the 0V is arriving. (Attached is the simulated result).

I have connected the VCC output(5V) internally generated to the PG Pin through a 100K Resistor and a bypass capacitor of 1uF but at the PG I am getting 30mV. When a 2V DC source is directly connected to PG pin I am getting a simulation error.

Can anyone guide me here on why is this happening? Am I using the right Spice Model?

over 3 years ago

0 Sirui Zhu over 3 years ago

TI__Intellectual 2090 points

Hi,

We have PSPICE-FOR-TI, you are welcome to use. And it seems the model in this tool works fine.

Regards

Sirui

0 Manish Poojary over 3 years ago in reply to Sirui Zhu

Prodigy 20 points

Dear Sirui,

Thanks for your reply. I have a requirement to simulate the files under the LTSpice tool hence I am unable to use the PSpice tool suggested by you.

As per my understanding, if the model is working fine in the above tool, it should be working fine in LTSpice as well. Do let me know if TI has an alternate model for the same.

Thanks,

Manish

0 Andy Chen over 3 years ago in reply to Manish Poojary

TI__Mastermind 34875 points

Hi Manish,

Sorry that we don't provide model compatible with other company's proprietary simulation software.

B R

Andy

0 Manish Poojary over 3 years ago in reply to Andy Chen

Prodigy 20 points

Alright. Thanks Andy.

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LMR33630: Simulation through PSpice model in LTSpice Results in 0V at output.