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Powering a White LED Flashlight with the TPS61090

This application report details how to drive a 3-W white LED from a single lithium-ion battery using the Texas Instruments TPS61090 low-power dc-dc boost converter to achieve efficiencies >90%. Design considerations and equations needed for driving a single, multiple-watt white LED are covered including efficiency improvements, peak switch current calculations, and a soft-start considerations.



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