LIGHTING DEVICE

To provide a lighting device capable of suppressing a light source from faintly emitting light in a turn-off state.SOLUTION: A lighting device 10 comprises: a non-insulation type AC-DC conversion circuit 14 that supplies a DC current to a light source 40; a constant current circuit 50 that has a switch element 51 connected in series with the light source 40 and controls the switch element 51; a voltage dividing resistor 90 that has a first resistive element 91 connected in parallel with the light source 40 and a second resistive element 92 connected between a circuit ground and a connection point between the light source 40 and the switch element 51; a feedback circuit 16 that controls an output power of the AC-DC conversion circuit 14 to make a voltage value at the connection point approach a reference voltage value; and a control circuit 80. The feedback circuit 16 has: a current path from the connection point to the circuit ground; and a breaking circuit 160 inserted in the current path and that breaks the current path when receiving a breaking signal. The control circuit 80 outputs the breaking signal to the breaking circuit 160 when receiving a turn-off signal.SELECTED DRAWING: Figure 1 【課題】消灯時に光源が微点灯することを抑制できる点灯装置を提供する。【解決手段】点灯装置１０は、光源４０に直流電流を供給する非絶縁型のＡＣ－ＤＣ変換回路１４と、光源４０に直列接続されるスイッチ素子５１を有し、スイッチ素子５１を制御する定電流回路５０と、光源４０に並列に接続される第一抵抗素子９１と、光源４０及びスイッチ素子５１の接続点と回路グランドとの間に接続される第二抵抗素子９２と、を有する分圧抵抗９０と、ＡＣ－ＤＣ変換回路１４の出力電力を制御することで、接続点における電圧値を基準電圧値に近づけるフィードバック回路１６と、制御回路８０と、を備え、フィードバック回路１６は、接続点から回路グランドに至る電流経路と、電流経路に含まれ、遮断信号が入力された場合に電流経路を遮断する遮断回路１６０と、を有し、制御回路８０は、消灯信号を受信した場合に、遮断回路１６０に遮断信号を出力する。【選択図】図１