A control circuit and method for a LED driver accurately control the output current of the LED driver by adjusting a reference voltage or a feedback voltage according to the input voltage of the LED driver such that the output current decreases with the decrease of the input voltage. At least one anti-snagging gusset is mounted on the support surface in front of the first plane. The biocides are added in an amount sufficient to minimize growth of organisms without adversely affecting the application of the binder composition to the glass fibers. In an embodiment, the fine filter is a filter bag made from a cloth material. The dielectric material layer prevents exposure of the handle substrate underneath the buried insulator portion during wet etches, thereby ensuring electrical isolation between the handle substrate and gate electrodes subsequently formed on the top semiconductor portion.