High-current LED drivers suffer from a significant efficiency loss due to the presence of a current regulation element (CRE) in series with the LED. In a conventional driver, either a series current source [1] or a sense resistor [2, 3] acts as a CRE to regulate the LED current (I LED ). In this paper, we seek to improve the efficiency by eliminating the series CRE. To this end, we employ a highly accurate current sensing scheme to directly regulate I LED  and achieve more than 13% efficiency improvement.
['Sachin Rao', 'Qadeer A. Khan', 'Sarvesh Bang', 'Damian Swank', 'Arun Rao', 'William McIntyre', 'Pavan Kumar Hanumolu']
A 1.2A buck-boost LED driver with 13% efficiency improvement using error-averaged SenseFET-based current sensing