What is the part number of D1? It needs to be a high-speed, low-loss, Schottky type, of at least 2A
It's a SCHOTTKY diode ,CDBC5100, 5A 100V.
What is the part number of L1. It needs to be an HF high-current type, of at least 1A.
it has no part number, I grab it from an old PC motherboard, it's wire size is around 0.5mm and it's core size is around 14mm
(the new values for R9/C6 are intended to give 50KHz oscillator frequency)
I have placed the pot to adjust the ferequency, now I have set it to about 155kHz
Now I have added another 0.5 Ohm in-series with R5, now the total is about 0.6 ohm, It works better now, now when I connect the load, it would drop from 51V to 42V,
And here is the oscillator waveform,note that the probe is set to 10X in all pictures.

The current sense Pin waveform

Also I have added a 1600uF input cap parallel to the 15V input, the input voltage waveform

The output waveform

And the circuit construction on a vera-board

I have removed the 1600uF cap for now, and the circuit works as before, also the MOSFET gets really hot, when it's under the load! I think it's for it's Rds on of 3Ohm, so lowering it would solve this problem.
when I increase the input voltage to 24V the voltage would not drop and it can fully charge the load, I want it to be able to deliver 51V to the load at least @15V, Also if it's possible I want to increase it's range to 11V input and 60V output, Do you have any Idea about how I can improve it? Also because of the space and size, I can not add any larger than 47uF input cap
