I made this 30v lab supply using mc34072 and everything is working fine except the voltage at output is not.going below 15mv as it should go to 0 and the current limit is not working below 36ma as the current limit should work till 2ma as stated, please help.
The voltage at
Voltage pot 1st pin=11.2 v, 3rd pin=0.008
Current pot 1st pin=1.2v, 3rd pin=0.014
Current shunt are two .22ohm resisitors in series which gives me 1.22v voltage drop at 30v 3amp
My concern is that ,1- voltage should go to zero which is not going and is about to 15mv whe voltage pot turned to zero.
2-current limit is working till only 36ma and not below it..
login
0-30 Vdc Stabilized Power Supply
in Projects Q/A
Posted
Hi! ,Everybody
I made this 30v lab supply using mc34072 and everything is working fine except the voltage at output is not.going below 15mv as it should go to 0 and the current limit is not working below 36ma as the current limit should work till 2ma as stated, please help.
The voltage at
Voltage pot 1st pin=11.2 v, 3rd pin=0.008
Current pot 1st pin=1.2v, 3rd pin=0.014
Current shunt are two .22ohm resisitors in series which gives me 1.22v voltage drop at 30v 3amp
My concern is that ,1- voltage should go to zero which is not going and is about to 15mv whe voltage pot turned to zero.
2-current limit is working till only 36ma and not below it..
Please i appreciate any help..