Patent ID: 9148917
Filing Date: 2015-09-29
Classification: H05B,Y02B

Abstract:
1. A load driving device comprising: a switch element configured to generate an output voltage to a load from an input voltage depending on an ON/OFF operation of the switch element; a switch controller configured to control the ON/OFF operation of the switch element such that a feedback voltage obtained by subtracting a dropped voltage of the load from the output voltage and a predetermined reference voltage are maintained to be consistent; and a variable current source configured to perform ON/OFF controlling of a driving current flowing to the load in response to a driving current control signal, wherein the variable current source is coupled to the load, and the driving current passed through the load flows through the variable current source, and wherein the switch element is turned on in synchronization with the driving current, and thereafter, when the switch element is in an ON state at an OFF timing of the driving current, the switch controller maintains the switch element in the ON state and, thereafter, turns off the switch element when an ON period of the switch element reaches a predetermined period.