Light emitting element driving device

A light emitting element driving device comprising:

• a current driver configured to generate a current to be passed in light emitting elements for a plurality of channels;
• a dimming controller configured to control the current driver;
• a control logic circuit including a register;
• and
• an external terminal to which a setting resistor can be externally connected,
• wherein
• in a normal mode in which light emission control for the light emitting elements is performed by the dimming controller, if no communication signal from an external microprocessor is recognized beyond a first predetermined period, the control logic circuit shifts from the normal mode to a first limp home mode, and
• in the first limp home mode, the dimming controller
• sets a light emitting element current set value based on a terminal current set value commensurate with a resistance value of the setting resistor as well as a DC dimming set value for each of the channels set in the register,
• controls the current driver so as to generate a current with the set light emitting element current set value, and
• turns on and off the current driver based on a PWM on-duty set value for each of the channels set in the register.