Patent attributes
The present invention particularly discloses a novel feedback circuit, mainly comprising: a signal sampling unit, a feedback unit, a signal concerting unit, and a signal adjusting unit. During the operation of the feedback circuit, a current-mode error amplifier unit is configured to output a current error signal based on a current sampling signal and a dimming signal outputted by the signal converting unit, so as to activate a PWM controlling unit to stabilize an output current of a LED driver circuit. In the meantime, a voltage-mode error amplifier unit cooperates with the PWM controlling unit to adaptively regulate an output voltage of the LED driver circuit based on a voltage sampling signal and an adjustment signal outputted by the signal adjusting unit, in order to facilitate the LED driver circuit provides a constant output power.
