An LED driver has a primary side regulation with at least one input connected to the AC power line, and at least two outputs. At least one output is for driving LEDs and at least one output is for providing auxiliary power for associated circuits. The driver is constructed using the flyback principle, having at least one flyback transformer which has at least one primary winding connected to a flyback switching transistor. At least one principal output winding is connected to the LED load, and at least one feedback winding is connected to a control chip. At least one auxiliary winding drives the auxiliary power output. The auxiliary winding has a coupling coefficient to said feedback winding which is greater than the coupling coefficient between the principal output winding and the feedback winding.