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PDF DN86 Data sheet ( Hoja de datos )
| Número de pieza | DN86 | |
| Descripción | Reduced component count and compact reference design | |
| Fabricantes | Zetex Semiconductors | |
| Logotipo |  |
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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
1 page  
DN86
smoothed the ripple may drop below the combined LED forward voltage which stops the
switching regulator and so reduces the average current in the LEDs. This will also reduce the
average lumens output.
C1 [µF] Vin [V]
100 12.70
150 12.60
200 12.53
300 12.50
Iin[A]
0.303
0.394
0.432
0.386
Vout[V] Iout[A]
9.28
9.50
9.55
9.70
0.225
0.271
0.293
0.295
Efficiency
54%
52%
52%
60%
Current
Accuracy
25%
10%
2%
2%
Table 3 AC input voltage
Figures 5 to 7 show the input voltage ripple and LX voltage varying the input capacitance value
Cin = C1 + C2 + C3. The higher the input capacitance the higher to output current precision and
the average lumens outputs. The case with Cin=300µF has the best performance both as efficiency
and current precision. Reducing the input capacitance the output current precision will decrease
up to 25% with system efficiency always above 50%.
Figure 5 Cin=300µF
Figure 6 Cin=200µF
Issue 1 - October 2007
© Zetex Semiconductors plc 2007
5
www.zetex.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DN86.PDF ] | |
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