Led driving device and lighting device

An LED (light emitting diode) driving device that performs a dimming operation of an LED module according to a dimming instruction signal, the device comprising:

• a dimming controller that receives the dimming instruction signal and generates a dimming signal according to the dimming instruction signal;
• and
• a driving circuit that supplies an output current to the LED module based on the dimming signal generated by the dimming controller,
• wherein the driving circuit unit includes:
• a converter controller that generates a drive signal based on the dimming signal and outputs the drive signal to a first switching element;
• a first current setting circuit that is connected between the first switching element and a ground;
• and
• a second current setting circuit that is connected in parallel to the first current setting circuit, and
• wherein the dimming controller controls an operating state of the second current setting circuit to switch an adjustment range of the output current in response to the dimming signal and a change characteristic of the output current in response to the dimming signal.