DN86

DN86 Reduced component count and compact reference design for MR16 replacement lamps using multiple 1W LEDs Silvestro Russo, October 2007 Introduction MR16 lamps are one variety of Multifaceted Reflector (MR) lamps that usually employ a halogen filament capsule as the light source. They are used in many retail and consumer lighting applications where their size, configurability, spot-lighting capability and aesthetics provide utility and creativity. Low efficiency, heat generation and halogen capsule handling issues are among the disadvantages of the technology. They typically operate from 12V DC or 12V AC, using conventional electromagnetic transformers. LEDs offer a more energy efficient and no radiated heat solution to replace some halogen lamp applications. This reference design is intended to fit into the base connector space of an MR16 style LED lamp. The design has been optimized for part count and thermal performance. The design can be used with up to 3 1W LEDs in the Lens section. This can be arranged to suit the luminary designer's requirements. Figure 1 MR16 application with ZXLD1350 Data sheet It is recommended that this design note is used with the data sheet for the ZXLD1350 see http://www.zetex.com/3.0/pdf/ZXLD1350.pdf Issue 1 - October 2007 © Zetex Semiconductors plc 2007 1 www.zetex.com DN86 Description The system diagram of the MR16 lamp solution with ZXLD1350 and ZXSBMR16PT8 is shown in Figure 2, and Table 1 provides the bill of materials. Figure 2 Sy...