Load driving circuit and method of setting load current thereof

Details Load driving circuit and method of setting load current thereof Load driving circuit and method of setting load current thereof

2011-07-26

2011-07-26

Tran, Anh Q (Department: 2819)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

Current generator control

C315S291000, C315S2090SC, C315S308000

Reexamination Certificate

active

07986109

ABSTRACT:
A load driving circuit is disclosed that allows a charge pump circuit to operate at an optimum step-up ratio without frequently changing the step-up ratio. The load driving circuit includes a step-up circuit; a current setting circuit that sets a value of an electric current to be supplied to a load; a constant current circuit generating a constant electric current having the set value; a determination circuit; and a control circuit. In response to a load current setting signal, the current setting circuit sets the electric current to be maximum, and decreases the electric current step by step down to a preset value. Each time the electric current is decreased by one step, the control circuit changes the step-up ratio according to the determination results of the determination circuit, until the constant current circuit supplies the set electric current.

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