How to Read a Datasheet: LED Fundamentals

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In this presentation on How to Read a Datasheet we will examine the key parameters specified on every page of an LED Datasheet from OSRAM Opto Semiconductors. The Datasheet captures some of the most …

In this presentation on How to Read a Datasheet we will examine the key parameters specified on every page of an LED Datasheet from OSRAM Opto Semiconductors. The Datasheet captures some of the most important technical characteristics of an LED. These include electrical, optical and thermal quantities, knowledge of which is paramount for an LED system design. Also, it has information on ordering codes, labeling and packaging of the LEDs.

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  • 1. LED FundamentalsHow to Read aDatasheet(Part 1 of 2) Typical/MaximumCharacteristics and Binningg08-19-11
  • 2. LED Parameters Optical Quantities Electrical Quantities  Luminous Intensity IV  Forward Voltage VF  Luminous Flux V  Forward Current IF  Luminance LV  Reverse Current IR  Radiation Characteristics 2φ  Dominant Wavelength dom  Color Coordinates cx, cy Thermal Quantities Misc  Junction Temperature Tj  CRI  Temperature Coefficient TC dom  Efficiency  Thermal Resistance RthJSLED Fundamentals | How to Read a Datasheet | Page 2
  • 3. OSLON SSL (LUW CP7P)LED Fundamentals | How to Read a Datasheet | Page 3
  • 4. Ordering Information  Luminous Flux at binning current is listed in lumens (lm) or millilumens (mlm).  Luminous Intensity at binning current listed in candela (cd) or millicandela (mcd).  Example LUW CP7P-KSKU-5E8G-35  KSKU: One brightness group KS, KT or KU will be shipped for any one reel.  5E8G: One chromaticity group from 5E to 8G will be shipped for any one reel.  35: One forward voltage group 3, 4, or 5 will be shipped for any one reel.LED Fundamentals | How to Read a Datasheet | Page 4
  • 5. Maximum Ratings  Maximum permissible surge current for pulsed operation is defined by pulse duration, duty cycle and frequency for a given solder point temperature (Ts).LED Fundamentals | How to Read a Datasheet | Page 5
  • 6. Typical CharacteristicsLED Fundamentals | How to Read a Datasheet | Page 6
  • 7. Chromaticity Coordinate GroupsLED Fundamentals | How to Read a Datasheet | Page 7
  • 8. Chromaticity CoordinatesLED Fundamentals | How to Read a Datasheet | Page 8
  • 9. Brightness and Forward Voltage GroupsLED Fundamentals | How to Read a Datasheet | Page 9
  • 10. Spectral Emission V is the human eye sensitivity curveLED Fundamentals | How to Read a Datasheet | Page 10
  • 11. Radiation Characteristics  For OSLON SSL (LUW CP7P) the radiation curve hits the 50% line at (φ )40°  Therefore the viewing angle (2 φ) is here equivalent 80°LED Fundamentals | How to Read a Datasheet | Page 11
  • 12. LA CP7P Peak wavelength Dominant wavelength Wavelength with the highest emitted electromagnetic Wavelength considering human eye power sensitivity; defines the color we can seeLED Fundamentals | How to Read a Datasheet | Page 12
  • 13. LED FundamentalsHow to Read aDatasheet(Part 2 of 2) CharacteristicCurves, Dimensions and ,Packaging08-19-11
  • 14. Forward Voltage  Increase of forward voltage leads to higher current  For special applications, forward voltage grouping maybe necessary • OSRAM offers voltage grouping • Each reel contains only one forward voltage groupLED Fundamentals | How to Read a Datasheet | Page 14
  • 15. Forward Current  The current through the LED determines the intensity/ flux output from the LED.  Also, there is a slight variation in the color of the LED, depending on the LED currentLED Fundamentals | How to Read a Datasheet | Page 15
  • 16. Junction Temperature As Junction Temperature increases  Forward Voltage decreases  Luminous Flux decreasesLED Fundamentals | How to Read a Datasheet | Page16Cx, Cy decreases
  • 17. Maximum Forward CurrentLED Fundamentals | How to Read a Datasheet | Page 17
  • 18. Pulse Current The maximum permissible pulse current depends on :  pulse duration p  duty cycleLED Fundamentals | How to Read a Datasheet | Page 18
  • 19. Package Dimensions  LED is protected by ESD device which is connected in parallel to LED-Chip  The notch on the thermal pad indicates the cathode padLED Fundamentals | How to Read a Datasheet | Page 19
  • 20. Tape and ReelLED Fundamentals | How to Read a Datasheet | Page 20
  • 21. Recommended Solder Pad LayoutLED Fundamentals | How to Read a Datasheet | Page 21
  • 22. Soldering ProfileLED Fundamentals | How to Read a Datasheet | Page 22
  • 23. Labeling/Tape and ReelLED Fundamentals | How to Read a Datasheet | Page 23
  • 24. PackagingLED Fundamentals | How to Read a Datasheet | Page 24
  • 25. RevisionsLED Fundamentals | How to Read a Datasheet | Page 25
  • 26. RemarksLED Fundamentals | How to Read a Datasheet | Page 26
  • 27. Disclaimer All information contained in this document has been checked with the greatest care. OSRAM Opto Semiconductors GmbH can however, not be made liable for any damage that occurs in connection with the use of these contents. OSRAM Opto Semiconductor GmbH makes no representations and warranties as to a possible interference with third parties intellectual property rights in view of products originating from one of OSRAM Opto Semiconductor GmbHs partners, or in view of products being a combination of an OSRAM Opto Semiconductor GmbHs product and a product of one of OSRAM Opto Semiconductor GmbHs partners. Furthermore OSRAM GmbH s partners Furthermore, Opto Semiconductors GmbH cannot be made liable for any damage that occurs in connection with the use of a product of one of OSRAM Opto Semiconductor GmbHs partners, or with the use of a combination of an OSRAM Opto Semiconductor GmbHs product and a product of one of OSRAM Opto Semiconductor GmbHs partners.LED Fundamentals | How to Read a Datasheet | Page 27
  • 28. Thank you for your attention.