hello guys this is the curcuit i have build.
supply voltage is 12 V
the curcuit works just fine with simulation and i build it in real pcb. i adjust VR1 and set output voltage to be 1 volt. and i adjust VR2 to be as much current its can give it is 10 k pot. its works with 6.7 Amps voltage drops of course but its okay. the problem is when i lower the R6 more and curcuit should draw more then 6.7 or about. the curcuit instead of just staying at 6.7 amps like i adjusted to be its not. its just drops below 2 amps even it drops to 0.02 amps . i mean voltage at R7 of course gets higher then set voltage and makes IC (bbb ) output to HIGH and that makes Q2 operate and makes Q1 shut down so the current drops. i get that. but when that happens R7 voltage drops below set voltage , IC bbb should cut off the base voltage and it should still try to give me the current i set it to 6 amps or so . is that wrong ? can you guys help me please .
supply voltage is 12 V
the curcuit works just fine with simulation and i build it in real pcb. i adjust VR1 and set output voltage to be 1 volt. and i adjust VR2 to be as much current its can give it is 10 k pot. its works with 6.7 Amps voltage drops of course but its okay. the problem is when i lower the R6 more and curcuit should draw more then 6.7 or about. the curcuit instead of just staying at 6.7 amps like i adjusted to be its not. its just drops below 2 amps even it drops to 0.02 amps . i mean voltage at R7 of course gets higher then set voltage and makes IC (bbb ) output to HIGH and that makes Q2 operate and makes Q1 shut down so the current drops. i get that. but when that happens R7 voltage drops below set voltage , IC bbb should cut off the base voltage and it should still try to give me the current i set it to 6 amps or so . is that wrong ? can you guys help me please .