I'm using this schematics and +12VDC input to get 5VDC output, but for reasons that I don't know the output is around 7VDC. I solder the components myself and run the IC without any load. If I don't use the diode, the 2 capacitors and the coil - the effect is the same - around 7VDC. And if I connect only the Vin (with +12VDC input) and GND (without "enable" and "feedback" pins connected), the Vout is around 12VDC. If you guys have any idea why I can't make it to 5VDC or where is the problem, i'll be thankfull. If you need more information - ask me, i'll provide it.
You can't just experiment with a switch mode regulator by removing or disconnecting parts, unless you want to release magic smoke.
I assume you have used the exact parts, like a schottky diode (not a standard diode) and "low esr" capacitors.
Is it a fixed voltage, or adjustable one.
If it's an adjustabel one, what are the feedback resistor values.
You should test the regulator with a small load, e.g. a 1k resistor.
Post a picture of your work.
Leo..
The tracks where heavy currents flow need to be kept short and thick.
You also need to consider the loops that current flows in during different portions of the switching cycle.
Try to route the feedback signal well away from the inductor.
Some layout guidance is given here, and also here.
