Lm2576 adjustable psu problem

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polashd

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I’ve made a power supply circuit based on the attached diagram which I found from the net. I modified it little bit to be able to control both voltage & current. Added high value resistors parallel to high value caps to avoid accidental shock as they may hold energy for long time. This also helps switching to lower voltage faster.

Now the problem is the output voltage is very low. It rises up-to little over 7v (according to formula which should be little more then 36v) and the rise is also very slow.

I can’t understand why its behaving like this.
Can any one please suggest me?
 

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