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LM27403: I am unable to get more than 600mA out of the supply when I ramp up the load and unable to start the supply at all if the load is greater than 400mA.

Kevin Lai
Intellectual 2916 points
Part Number: LM27403

Hello,

Customer is having a problem with the device: 

input of 14V and an output of 1V at 1A.

I am unable to get more than 600mA out of the supply when I ramp up the load and unable to start the supply at all if the load is greater than 400mA. I copied the WebBench simulation that I generated at the time but when I try to simulate it now, I get different values.  Virtually all of the components are different. Was it wrong?  Why are they different?  I also cannot run a simulation for this design now.  I get an error of “Simulation not enabled for this design.”

What could be causing this issue?

Any comment on their questions regarding the webench? 

Thanks!

Kevin