the LED application that is less than 40V to inputting voltage, if output voltage to be less than input voltage, choose step-down develop to attack structure. On this foundation, undertake choosing again according to exporting electricity. If output electric current to be more than 1.2A, the NCP3065 of manostat of switch of 1.5A constant current that can use a design to be used at spending LED power supply for Gao Liang. This parts of an apparatus has the voltage of extremely low feedback of rating 235mV, the average electric current that suits to be strung together to LED has steady flow. It is had come high the limits of wider input voltage of 40V, make its can work in 12Vac or 12Vdc power source. The version that NCP3065 earlies childhood to apply for suiting car class, NCV3065. Need to use few exterior cell only (like MOSFET or) of low VCEsat switch, NCP3065 switch manostat can be configured attack for the develop such as step-down, step up or SEPIC structure. This makes it still can apply with what be less than 1.2A at electric current. Be less than the application of 1.2A to electric current, still can use NCP1215 MOSFET to make step-down converter. the application that is less than 500mA and input report crimp to output voltage nearly to electric current, can use such NUD4001 constant to shed linear driver.