Lighting driver circuit and light fixture

摘要

A lighting fixture that suppresses blinking and flickering phenomena even when operating at very low luminance levels includes: a light source including at least one solid state light-emitting element; and a lighting driver circuit controlling the light source in accordance with a control signal. The lighting driver circuit includes an isolating flyback circuit and a control circuit. The isolating flyback circuit switches power from a DC power source and smooths the output. The control circuit controls switching operation performed by a switching element of the isolating flyback circuit via PWM signal. The control circuit provides a frequency component in accordance with the control signal to a reference signal outputted by a reference signal generator. In accordance with results of detection of the reference signal and a current flowing through the light source, the control circuit provides a stop period during which a driver controller driving the switching element is stopped.