Does the mosfet turn on to the same degree (conduct the same amount of Amperes) whether you apply 5V or 12V at the gate?
It may help if you try a transistor for the switching device instead of the mosfet.
--> Thousands i think. At least hundreds.Is there any ic's available that will do feedback and adjust the pwm duty cycle so the output voltage stays at 5v dc?
A look at TPS2811 datasheet reveals a reason why your circuit can't work. The device doesn't perform the intended level translation, it can't be driven by 5V logic when supplied with 12V. Choose a different gate driver circuit.
Secondly, driving a floating NMOS transistor by a ground referred gate driver isn't a good idea. It can work under restricted conditions, e.g. the input voltage must not be higher than 6.5V, the transistor doesn't have a threshold voltage in the upper range of type variation. Better use a logic level MOSFET (e.g. Vth = 2.5V) or a bootstrap gate driver.
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