LP38691-Q1: LP38691-Q1

Ângela Meireles

Part Number: LP38691-Q1

Hello,

I found following model on LP38691-Q1 product page.
-LP38691_3P3 Unencrypted PSpice Transient Model

I need 2.5V output model but it seems 3.3V fixed output model.
Could you give me 2.5V output model?

I'm thinking of using LP38691QSD-2.5/NOPB on my PCB. Is it possible to have this module for PSpice?

Thank you!

Best regards,
Ângela Meireles

11 months ago

0 Nick Butts 11 months ago

TI__Mastermind 41425 points

Hi Ângela,

In the .lib file, the 30.1k and 49.364k resistors are the feedback resistors (i.e. for this model VOUT = vref * (1+R1/R2) = 1.25 * (1+49.364 / 30.1 = 3.3V). If you change the 49.364k resistor to 30.1k, the output will be set to 2.5V.

Regards,

Nick

0 Ângela Meireles 11 months ago in reply to Nick Butts

Prodigy 10 points

Hi Nick,

Thank you so much for the quick answer.

I changed the R_R4 = 30.1K, but the Vout remains very close to 3V.

I will send in attachment the image of the circuit and the output:

Could you help me?

Thank you very much!

Best regards,
Ângela Meireles

0 Nick Butts 11 months ago in reply to Ângela Meireles

TI__Mastermind 41425 points

Hi Ângela,

I think it's because you tied SNS to the input instead of the output. With this configuration the device is basically just in dropout. See if changing this fixes the issue.

Regards,

Nick

0 Ângela Meireles 11 months ago in reply to Nick Butts

Prodigy 10 points

Hi Nick,

Yes that solved the issue.

Thank you so much for the support.

Best Regards,
Ângela Meireles

0 Nick Butts 11 months ago in reply to Ângela Meireles

TI__Mastermind 41425 points

You're very welcome!

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LP38691-Q1: LP38691-Q1