
A DOB lighting system uses only solid state driver components which are available in surface-mount packages capable of being assembled on circuit boards with a single-sided copper construction. This makes it possible to mount driver components a metal-core printed circuit board (MCPCB) where LEDs are mounted. Typically, the driver is designed as a linear power supply. Since there is no high frequency switching, electromagnetic interference (EMI) is practically absent in linear power supplies. The complete absence of EMI radiation allows linear power supplies to be designed with a significantly reduced parts count. The small circuit parts count and small form factor of circuit components contribute a small footprint of the driver, which introduces minimal impact on the LED assembly when it comes to photometric performance. The drive current is regulated by small driver ICs without using electrolytic capacitors. The weakest component with the shortest life expectancy determines the life of the driver. The removal of electrolytic capacitors translates to significantly improved driver reliability.
