LED driver circuit and LED lighting device thereof

A driver device, comprising:

• a loading module;
• a first voltage drop module, connected to a power source to convert a direct current voltage;
• a constant current driving module, connected to the first voltage drop module to receive the converted direct current voltage to drive the loading module;
• an auxiliary winding module, connected to the first voltage drop module and the constant current driving module to receive the converted direct current voltage;
• a second voltage drop module, connected to the first voltage drop module to buck the converted direct current voltage and to correspondingly output an optimized voltage;
• a DIP switch module, connected to the second voltage drop module to receive the optimized voltage to select a predetermined current level, and to output an electrical signal;
• a control module, connected to the DIP switch module, the second voltage drop module and the auxiliary winding module;
• and
• the constant current driving module, connected to the first voltage drop module, the auxiliary winding module and the control module to calculate a required driven voltage and to determine a working status of the loading module based on a voltage level relationship between the required driven voltage and an actual voltage level;
• wherein the control module outputs a corresponding pulse signal that corresponds to the electrical signal for controlling the constant current driving module.