Current foldback circuit based on constant current power supply mode

The utility model discloses a current foldback circuit based on constant current power supply mode, including load current detection circuitry, error magnification circuit and branch circuit, the error magnification circuit comprises operational amplifier and divider resistance, operational amplifier's input and load current detection circuitry link to each other and receive current load current signal, the presupposition voltage end is connected to another input of operational amplifier, operational amplifier's output and branch circuit link to each other. The utility model provides a current foldback circuit based on constant current power supply mode, through setting up load current detection circuitry, error magnification circuit and branch circuit, when arrival current surpassed the setting value, the start -up overflowed the branch stream unit, and with unnecessary partial electric current from bypass reposition of redundant personnel, the electric current that keeps flowing past the load is avoided loa