TINA/Spice/LM25117: Cout value change

Kuramochi Tadahiko

Guru 28715 points

Part Number: LM25117
Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi,

I'm simulating LM25117 TINA-TI Transient Reference Design(Load transient).

I don't know how to change Cout(C15) because where input value is nothing in the property as below.

Could you tell me how to change Cout value?

Best Regards,

Kuramochi

over 7 years ago

0 Robert Blattner over 7 years ago

TI__Expert 6245 points

Hello Kuramochi,

This model is very finicky. We are working on why. In the meantime, you can click "enter macro" for Cout and change the value of C1 in the netlist. The simulation works well when this approach is taken rather than simply replacing Cout with a capacitor.

Please let us know if this works for you.

0 Kuramochi Tadahiko over 7 years ago in reply to Robert Blattner

Guru 28715 points

Robert-san,

Thank you for your information.

Does it mean that Cout value is 300uF on default?

Best Regards,

Kuramochi

0 Robert Blattner over 7 years ago in reply to Kuramochi Tadahiko

TI__Expert 6245 points

Hello Kuramochi,

Yes, it is very close. R1 and C1 are the capacitance and ESR. Other capacitances are much smaller.

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TINA/Spice/LM25117: Cout value change