LDO line and load regulation issue

[satiz]

Hi all,
I am using LM1085 in one of my design, Instead of 5 Volts output I am getting 4.75 volts only. Any one please explain me why this happening ? Also at 300mA load LDO getting heat. input to the LDO is 12 Volts. Schematic is attached for your reference.

 

[KlausST]

Hi,

The schematic you posted is an example schematic. There is a goid chance that this circuit will work. ;-)
Therefore I assume: not the given schematic is wrong, but your circuit hase some issues.

But we need to see your curcuit. And how you wired it. And what your voltages are. What circuit you used.
--> pictures of your circuit with additional informations.
Like: when the output voltage us only 4.75V...what is your measured input voltage at the same time?

Urgent: read the whole datasheet. (That's what we need to do, too) and carefully follow the instructions, calculations, design considerations, layout considerations..

Klaus