A Current-Mode Digital Controlled Buck-Boost DC-DC Converter for LED Driver
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초록
This paper presents a digital LED Driver that provides a high quality of the back light for display modules. The proposed LED driver is implemented in 0.18um CMOS process. Proposed LED driver consists of three types of circuits, a buck-boost converter, circuit for power efficiency and color reproducibility improvement and a circuit for constant current driving. The digital designed buck-boost converter improves power efficiency. To compensate for forward biased voltage of LED according to temperature, the regulator block generates a self-controlled variable reference voltage, in addition to that it also provides an optimal power efficiency of power converter. The regulator that gives a constant current to LED automatically controls the gate voltage that is needed to determine the minimum voltage headroom to prevent power deficiency. The supplying voltage of this circuit is 4.2V, 0V. Maximum operating frequency is 1MHz. Proposed LED driver can be applied to a low power chip-set projector for HD quality micro-display and in HMD also.
Abstract
This paper presents a digital LED Driver that provides a high quality of the back light for display modules. The proposed LED driver is implemented in 0.18um CMOS process. Proposed LED driver consists of three types of circuits, a buck-boost converter, circuit for power efficiency and color reproducibility improvement and a circuit for constant current driving. The digital designed buck-boost converter improves power efficiency. To compensate for forward biased voltage of LED according to temperature, the regulator block generates a self-controlled variable reference voltage, in addition to that it also provides an optimal power efficiency of power converter. The regulator that gives a constant current to LED automatically controls the gate voltage that is needed to determine the minimum voltage headroom to prevent power deficiency. The supplying voltage of this circuit is 4.2V, 0V. Maximum operating frequency is 1MHz. Proposed LED driver can be applied to a low power chip-set projector for HD quality micro-display and in HMD also.
참고문헌 (14)
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