Issue 1 - October 2007

1

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© Zetex Semiconductors plc 2007

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