erfan_fossile
Newbie level 4
Hai,
I am presently using LM317 in my design and using it to generate 3.3V by using 3.7K for R1 and 4.7K for R2. The formula used is
Vout= 1.25 [1+R2/R1] + Iadj R2. Iadj is assumed to be 100uA.
I am getting 7.5V instead of 3.3V. Different datasheet and applications notes are saying different formulae. I tried connecting Adjust pin directly to ground and without load and I observed 8.5V instead of 1.25V. All this experiments were done without load. Please help.
I am presently using LM317 in my design and using it to generate 3.3V by using 3.7K for R1 and 4.7K for R2. The formula used is
Vout= 1.25 [1+R2/R1] + Iadj R2. Iadj is assumed to be 100uA.
I am getting 7.5V instead of 3.3V. Different datasheet and applications notes are saying different formulae. I tried connecting Adjust pin directly to ground and without load and I observed 8.5V instead of 1.25V. All this experiments were done without load. Please help.