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TPS61088: Unable to perform AC analysis on PSpice

Varsha Jayasimha
Prodigy 10 points
Part Number: TPS61088
Other Parts Discussed in Thread: POWERSTAGE-DESIGNER

Hello,

I am trying to perform stability analysis of TPS61088 on PSpice and I haven't been able get the gain and phase plots correctly. I've tried to use both the transient model and also designed the circuit based on Webench power designer, but unfortunately I couldn't perform the AC analysis. Could you please provide some suggestions?

Regards,

Varsha

  • 0
    TI__Genius 16245 points

    Hi Varsha,

    The PSpice get an AC sweep inside. But usually, we don't use it.

    It is recommended to use TI's PowerStage-Designer to get the gain and phase of the circuit.

    POWERSTAGE-DESIGNER Design tool | TI.com

    We will update the calculate tool for TPS61088 subsequently.

    If needed, we can have a calculation result as well as a test result on our EVM for you your condition.

    Best Regards

    Fergus

  • 0 in reply to Fergus He
    Prodigy 10 points

    Hi Fergus,

    Thank you. So I am trying to deign the circuit with fsw = 800kHz for Vout = 10V and Vin = 5V. In webench designer, it won't allow me to input that high switching frequency and looks like even in the Powerstage designer, the gain and phase are highlighted in red when I input the values. 

    Regards,

    Varsha

  • +1 in reply to Varsha Jayasimha
    TI__Genius 16245 points

    Hi Varsha,

    Please download and use the attached file in power stage design tool.

    Open power stage design tool--Boost--Loop calculator--open--select the file.

    Fullscreen tps61088-800k.txt Download 
    LOOP_CALCULATOR
4.5
10
2
2.2
10
5
4
55
2
800
1
10
8
3
2
1.2
190
80
1
174
3
1
1
1
409000
54000
0
20000
0
1
4.7
0

    I set the input as 4.5V for some ripple and the output to be 2A. you can change according to your spec.

    please check whether the inductance and output capacitors meet your requirements.

    You can see the Rcomp, Ccomp and CHF by clicking COMP Networks.

    Please connect me if you get any question.

    Best Regards

    Fergus

  • 0 in reply to Fergus He
    Prodigy 10 points

    Hi Fergus,

    I updated the inductance and output caps according to my requirement and still got the correct analysis. Thank you so much!