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I have done a circuit for led driver.

Here no matter what happens if the open loop gain of the op amp is large the output voltage across the resistance R1 is always 500mV (and hence the current across the led is constant) but something irrelevant is happening when I tried to simulate it. I tried this in another simulation software and it worked perfectly.

Here's the link

https://www.circuitlab.com/circuit/8nk24s/leddriver/

Thanks a lot :)

Hi IVenky,

Sorry but your schematic does not look right.

Is this supposed to be a linear or a switch mode LED current controller?

Can you upload or post a link to your original simulation or a screenshot of the schematic?