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Modification of LM25117 AVG Model as per my design

Rohit Murkar
Prodigy 60 points
Other Parts Discussed in Thread: LM25117, TINA-TI

Hi ,

 

I wish to use LM25117 IC in my Design

I am found its avg model on TI site. But this model is already configured for Vout 5.2V and Iout=6A

Whereas my requirement is Vout 5.2V and Iout 1.3A

 

I have done following modifications

1. Changed value of Feedback Resistors

2. Changed value of COMP components 

3. Changed value of Load Resistor

5. Changed value of inductor and Input Voltage

 

But I am not sure about Inductor, Cap in series with AC source and Cout Cap.

 

Please Suggest

Regards,

Rohit M

 

  • 0
    TI__Mastermind 39210 points

    The Inductor and Cap in series with the AC source are only for injecting the AC signal

    Closed Loop calculation for DC Bias point calculation since Inductor is shorted and Cap is open

    Open Loop calculation for AC analysis, since inductor is Open and Cap is shorted.

    You can leave it as is. Regarding the output cap, you can use WEBENCH to design the circuit for your needs. This will give you the complete BOM including Cout value.

    You an then simulate within WEBENCH itself or simulate in TINA-TI.