LM385-ADJ: Conflict of LM385-ADJ spice model and LM385-ADJ datasheet

Narukom Sakoonvilaikidcharoen1

Part Number: LM385-ADJ
Other Parts Discussed in Thread: ATL431LI, TL431LI, LM4041-N

Dear TI Staff

I downloaded LM385-ADJ spice model from your website, I simulate on LTspice and follow the circuit as I attached. I found that it is not working. But when I swap R2 and R3 the result is correct.

Which one I should trust between datasheet or this spice model? If the spice model is wrong could you provide the correct one?

Remark:

Datasheet link -->http://www.ti.com/lit/gpn/lm385-adj--

Spice model link -->www.ti.com/.../snvmb82<--

Circuit picture below

Best regards,

Sun

over 4 years ago

0 Marcoo Z over 4 years ago

TI__Mastermind 19370 points

Hi Sun,

The datasheet should be correct. I have ordered some devices of this flavor because I do not have them currently. I can try this

Is there a reason you want to use a LM385 vs a LM4041-ADJ or ATL431LI? I can confirm that both of those devices datasheet and models match.

-Marcoo

0 Narukom Sakoonvilaikidcharoen1 over 4 years ago in reply to Marcoo Z

Prodigy 20 points

Dear Marcoo

Thank you for your following about my issue.

I got this design from the last project of my company, then I use this circuit to be a reference for my current project.

I will look forward to your checking.

Best regards,

Sun

0 Marcoo Z over 4 years ago in reply to Narukom Sakoonvilaikidcharoen1

TI__Mastermind 19370 points

Hi Sun,

I requested samples of the LM385. They have arrived and I will verify the datasheet these coming days.

-Marcoo

0 Marcoo Z over 4 years ago in reply to Marcoo Z

TI__Mastermind 19370 points

Hi Sun,

The device matched the datasheet. I need to look at why the spice model did not function the same way.

I will feel confident using the device schematic that you have posted.

-Marcoo

0 Narukom Sakoonvilaikidcharoen over 4 years ago in reply to Marcoo Z

Prodigy 70 points

Dear Marcoo

Thank you for your help, so I can move forward with my project.

Also could I have this spice model of LM385 after you have the correct one?

Best regards,

Sun

0 Marcoo Z over 4 years ago in reply to Narukom Sakoonvilaikidcharoen

TI__Mastermind 19370 points

Hi Sun,

I agree that the model is not working properly. I can look into correcting the model or removing the non functional model. A fixed revision will take a while so I would not count on it in the next coming month.

If you don't need the low Iq of the LM385, you can use a LM4041-N ADJ or TL431LI and those have both working models and a variety of package options.

-Marcoo

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LM385-ADJ: Conflict of LM385-ADJ spice model and LM385-ADJ datasheet