jacky yang
New Member
hi,everybody!i am a new member of this forum,and i do appreciate any technical support from you.recently,i tried to built a linear regulator with a pnp power transistor.as you know,this is a very traditional classical scheme which can provide a very low voltage dropout,and after some experiment i found its performance very well,then i would like to add a current-limiting function to this circuit by using a simple transistor and a current sense resistor.unforturenately,the current limmit circuit did not work correctly.when the load current reached the limiting point,the output voltage increased instead of decreasing.the circuit schmatic garaph is in the attachment file,is there anyone can offer me some knowledge about the circuit ?thanks !