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DN86 Datasheet Reduced Component Count And Compact Reference Design

Manufacturer: Zetex (now Diodes Incorporated)

Overview: DN86 Reduced ponent count and pact 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 remended that this design note is used with the data sheet for the ZXLD1350 see http://.zetex./3.0/pdf/ZXLD1350.pdf Issue 1 - October 2007 © Zetex Semiconductors plc 2007 1 .zetex.

General 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 System diagram of ZXLD1350 MR16 Lamp Solution The ZXLD1350 is designed for LED current drive applications of up to 350mA.

The monolithic NMOSFET is sized appropriately to provide a cost-effective die size and is rated to 400mA, which with the hysteretic mode of operation (the inductor current waveform will ramp +/-15% about the nominal current set point) provides sufficient margin.

Key Features

  • of the ZXLD1350 are:.
  • Up to 380mA output current.
  • Wide input voltage range: 7V to 30V.
  • Internal 30V 400mA NDMOS switch.
  • High efficiency (>90% possible).
  • Up to 1MHz switching frequency The ZXSBMR16PT8 is a new space saving and thermally efficient device specifically designed for the critical requirements of MR16.

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More Datasheets from Zetex (now Diodes Incorporated)

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