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ISO1212: Simulating a design requirement

Manish Sharma2
Intellectual 380 points
Part Number: ISO1212

Hi,

I am designing a circuit with design requirement as attached.

While simulating the design in TINA, the Vout is not changing. 

I am not able to figure out the issue in the circuit.

i am attaching the TINA schematic and Design requirement figure.

Thanks

Manish Circuit.TSC

  • 0
    TI__Expert 6955 points

    Manish,

    I'm sorry you're having trouble here. Give us some time to run your simulation and conduct troubleshooting. Thank you.

    Respectfully,

    Lucas

  • 0 in reply to Lucas Schulte9
    TI__Expert 6955 points

    Manish,

    Would you be able to explain what it is you are trying to accomplish with the AC input? What are the outputs you are expecting?

    Respectfully,

    Lucas

  • 0 in reply to Lucas Schulte9
    Intellectual 380 points

    These are externally applied input, Can be AC or DC.

    i want the output be in correlation with AC/DC input which i can sense

    Regards

    Manish

  • 0 in reply to Manish Sharma2
    TI__Expert 6955 points

    Threshold calculator: www.ti.com/.../sllc457

    Reference Transient TINA Model

    Circuit_1.1.TSC

    Corrected TINA model

    Manish,

    Here are the issues with your model and intended application. The TINA model does not handle the isolated grounds. Both sides of the isolator need the same ground reference for simulation purposes as shown in the Reference TINA Model. Cin 1 and C in 2 are too high at 10uF and filter out frequencies well below 50Hz. Reducing these values to 10nF is more reasonable. 

    The same channels cannot be configured for both 240V AC and 24V DC at the same time. Each input channel of the ISO1212 needs to be configured a single type of expected input, such as 240V AC only, in order for the configuration of the proper voltage thresholds. Trying feed 240AC to a channel configuration for 24V DC will absolutely damage the ISO1212. In the opposite scenario, feeding 24V DC to a channel configured for 240V AC not have any output because because 24V would not be enough to reach the V(IH) threshold. Please look at the Threshold Calculator to calculate the proper R(th) and R(shunt) values as per the expected input.

    I have included a modified version of your model that works for an input of 240V AC. You will need more ISO1212 channels for the different types of inputs.

    Respectfully,

    Lucas