Patent ID: 8648543

Claim:
An illumination driving circuit for driving a light-emitting load, the illumination driving circuit comprising: a system voltage source; a switch component coupled between the system voltage source and the light-emitting load; an inductor component connected in series between the switch component and the light-emitting load; an inductor-current sensing module comprising a sensing resister component connected in series between the switch component and the inductor component; and a control module coupled to a controlling terminal of the switch component and configured for controlling a conductive state of the switch component, a virtual ground terminal of the control module being coupled between the sensing resister component and the inductor component, an inductor-current sensing terminal of the control module being coupled between the sensing resister component and the switch component, the control module calculating an inductor-current through the inductor component according to a voltage level of the inductor-current sensing terminal.