Simple discrete LED driver application from Nexperia. Link here (PDF)
This application note describes a 300 mA discrete LED driver, based on a buck-converter principle, with a cycle-by-cycle current control. It includes a proposal for a BOM and layout of a low cost, low component count solution.
Key applications for the driver are lighting applications, where constant LED brightness, high efficiency and low cost are important features. For example, automotive lighting applications require that general illumination and signage should not consume too much power when the motor is not running. The input voltage of +6 V to +18 V supports automotive requirements, too.
Additionally, battery driven handhelds such as flashlights or headlamps will benefit from the
topology and efficiency the driver delivers.