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LM76005: Not working when built in PSpice

Part Number: LM76005

Hi Experts,

Please assist us with the customer's concern below.

I made a buck converter design using WEBENCH, linking further down, which according to the WEBENCH simulation works fine. However, when I then built the exact same design in PSpice, it doesn't work at all and the voltage output is just a constant 24.5V, no matter what component values I seem to change.

Could you please help me with this design and tell me what I did wrong?

buck lm76005.zip

Best regards,

Jonathan