TE Connectivity Connector & Fixed CXA1507 LED with TE Connectivity Molex Connector & Fixing CXA2011 LED with Molex US reach connector Figure 1 Connector for XLamp ® CXA Series LEDs Figure 2 Solder joint locations for XLamp ® CXA series LEDs Table 1 Chemicals that can be used and should be avoided (This article is contributed by Cree)
AC emergency Backup Power Supply system,
basing on DC standby power supply, is equipped with single phase
(three-phase) DC/AV inverter. It is applied to provide uninterrupted
single phase (three-phase) AC power supply service for the important AC
electricity loads.
DC emergency standby power supply system consists of AC distribution, charging unit, storage battery DC distribution, automatic switching against city grid failed in power supply, etc. It is applied to provide uninterrupted power supply service for the important DC electricity loads.
Backup Power Supply Backup Power Supply,Battery Backup Power Supply,Ups Backup Power Supply,Backup Power Supply For Pc Xinxiang Taihang Jiaxin Electric Tech Co., Ltd , https://www.chargers.be
——C welding and processing of CXA series LED
Different from the traditional SMD package, the COB package LED is a single or multiple chip package directly on the aluminum substrate, which can enhance the heat dissipation performance of the LED. Due to the low thermal resistance of the COB package, low assembly cost and excellent light uniformity, it has been widely used in the lighting market. Cree launched the XLamp ® CXA2011 in 2011. In October 2012, March 2013, the XLamp ® CXA1507, CXA1512, CXA2520, CXA2530, CXA2540 and CXA3050 launched a total of six COB series products.
The new XLamp ® CXA series offers many advantages: simple assembly and easy machining, usually with one COB for one luminaire; the design of the pads makes it easier and more reliable to solder by hand, eliminating the need for PCBs, avoiding reflow and reducing costs The designed light source size is fully compliant with the Zhaga standard LES size definition; optimized for design simplification and lower system cost, providing 5,00 - 10,000 lm of luminous flux for high lumen output bulbs, track lights, Requirements for various applications such as downlights, spotlights, outdoor lighting and high ceiling lights. This article focuses on how the XLamp ® CXA family of LEDs and the devices containing them should be handled correctly during the manufacturing process.
First, XLamp ® CXA series LED processing considerations
To ensure proper use of LED, Cree recommends the following requirements when handling XLamp CXA series of LED or devices containing XLamp ® CXA series of LED?:
1. Avoid applying mechanical stress on the LED.
2. Do not touch the optical surface with your fingers or sharp objects. In the actual operation, when using the handheld XLamp ® CXA series LED, do not touch the lens or press the lens. When handling XLamp ® CXA series LEDs with tweezers, do not touch the lens. In order to avoid soiling or damaging the LED surface, thereby affecting the optical performance of the LED.
3. Cree recommends always taking appropriate anti-static grounding measures when handling XLamp ® CXA Series LEDs.
4. Cree recommends wearing powder-free latex gloves when handling XLamp ® CXA series LEDs.
Second, the way XLamp ® CXA series LEDs are fixed
To ensure efficient thermal management of the XLamp ® CXA family of LEDs, Cree recommends mounting the XLamp ® CXA Series LEDs on a suitably sized heat sink that depends on the drive voltage, current and operating environment. The most common method of installation involves inserting a gasket of thermal interface material (TIM) such as thermally conductive epoxy or thermal grease between the XLamp ® CXA series of LEDs and the heat sink. For optimum heat dissipation, the TIM thickness should be kept to a minimum while ensuring that there are no voids. For CXA15xx, CXA25xx, and CXA3050 LEDs, a reflective TIM or other pad should be used; if a darker TIM is used, the light output and efficacy may be slightly reduced. Representative suppliers of thermal interface materials include 3M, GrafTech, Laird, Lord and other suppliers.
The CXA15 and CXA25 and CXA30 series are packaged in an aluminum substrate that can be attached to the heat sink with epoxy or LED connectors. Many manufacturers have developed or are developing connectors to simplify the mechanical and electrical installation of the XLamp ® CXA series of LEDs. For example, Molex (180560, 180720, 180220) and TE Connectivity (5-2154874-2, 5-2154874-3), IDEAL (50-2001CR, 50-2102CR, 50-2234C), Midea Optics (ZJ017, ZJ018) , ZJ037), etc., have developed connectors for XLamp ® CXA series LEDs.
Thermal grease or thermal paste can achieve good heat conduction. Thermal grease or thermal paste has different cost depending on the thermal conductivity. The curing time is longer, and the LED positioning is not good. Once fixed, it is difficult to replace. The specially designed connectors are easy to assemble, can be electrically connected, have good repeatability, and can replace LEDs at any time, but for different application and design requirements, existing connectors are not completely matched with the design, so these two There are advantages and disadvantages in each way. In the choice, we must consider the cost, practicality and design matching requirements to determine.
The CXA2011 LED can be secured by diagonally two screw holes or by using a connector. When using a screw hole to secure the CXA2011 LED, Cree recommends using a 4th (/40) or M2.5 size screw. Excessive torque can cause damage to the LED array. The proper screw torque depends on a number of factors, including the thickness, size and type of thermal interface material, as well as the flatness of these materials and heat sinks. The mounting screws can withstand a safe torque of approximately 45 N·cm. 
Third, the surface temperature (TC) measurement point
The XLamp ® CXA Series LED surface temperature (TC) can be measured at a specified surface temperature measurement point located immediately adjacent to the pad anode or positive (+). This measurement point is shown below. Cree recommends using a conductive epoxy to mount the thermocouple. 
XLamp ® CXA series LEDs are suitable for wire bonding. Cree recommends soldering with a solderable iron with a soldering iron tip size of 1.8 mm. Due to the many variations in the heat sink system, LEDs, solder and torches, Cree does not provide specific soldering recommendations. After soldering, the XLamp ® CXA Series LEDs should be allowed to cool to room temperature for subsequent processing. Premature processing of the device may result in solder joint damage. Cree recommends not exposing the XLamp ® CXA Series LEDs to temperatures above 350 °C. When soldering wire connectors directly to XLamp ® CXA series LEDs, follow these practices.
1. Solder the contact pads of the XLamp ® CXA series of LEDs and apply the solder evenly over the contact pads.
2. Apply the appropriate solder to the wire and solder it to the XLamp ® CXA Series LEDs.
3. Ensure that the wires soldered to the XLamp ® CXA family of LEDs have sufficient strain relief to avoid pulling up the pads on the LEDs.
Cree recommends soldering the XLamp ® CXA series of LEDs with a “no-clean†solder paste so that there is no need to clean the PCB after reflow soldering. Cree recommends the following solder paste ingredients: SnAgCu (tin/silver/copper) and SnAg (tin/silver).
V. Chemical compatibility
According to the specific characteristics described in Cree's Chemical Compatibility Application Note, Cree found that certain chemicals often cause damage to the XLamp ® CXA series of LEDs. For LED systems containing the XLamp ® CXA series, Cree recommends not using these chemicals anywhere. Even if the amount of chemicals is small, the gas released may cause LED damage. The following is a list of representative chemicals and materials that can be used and avoided for LED production processes. Recommended chemicals Harmful chemicals found in the test 1 water Chemicals that may cause outgassing of aromatic hydrocarbon compounds (eg toluene, benzene, xylene) 2 Isopropyl alcohol (IPA) Methyl acetate or ethyl acetate (ie: nail polish cleaner) 3 Cyanoacrylate (ie: superglue) 4 Glycol ether (including Radio Shack® precision electronics cleaner – dipropylene glycol monomethyl ether) 5 Formaldehyde or butadiene (including Ashland PLIOBOND® adhesive)
Conclusion
This article focuses on the handling, fixing, soldering and chemical use considerations of the XLamp ® CXA series of LEDs. It is intended to help with lighting design and application. More detailed information can be found on the Corrie website. Found in documents such as sex applications.
Cree will participate in the Guangzhou International Lighting Exhibition on June 9-12, and the Cree booth will be located at Booth B02 in Hall 4.1 of Pazhou Exhibition Hall. More technical support and services are welcome to discuss with Cree's team in detail. 
Cree XLamp® high-power devices latest application guidelines and points of attention
"Cruid XLamp® High Power Devices Latest Application Guidelines and Points to Watch Updates"