Resting with a natural resin package can completely eliminate the deterioration factor. Since the light generated by the LED is reflected in the encapsulated natural resin, if a natural resin reflective plate that can change the direction of the light on the side of the chip is used, the reflector will draw light and make the light The amount of extraction is sharply reduced. Because of this, it is necessary to find ways to reduce the temperature of the LED chip , in other words, reduce the thermal impedance of the LED chip to the solder joint, which can reduce the burden of reducing the temperature effect of the LED chip.
The life of the relevant LEDs, such as the use of silicon packaging materials and porcelain ceramic packaging materials, can increase the number of years of operation of LEDs by a single digit, especially the flash spectrum of white LEDs includes short-wavelength light with wavelengths below 450 nm. The traditional epoxy gas natural resin encapsulation material is easily damaged by short-wavelength light. The large amount of high-power white-light LED accelerates the deterioration of the packaging material. According to the final test results of the manufacturer, the brightness of the high-power white LED has been less than 10,000 hours. If you reduce more than one-half, there is no way to satisfy the basic requirements of the long life of the illumination source. Up to now, there have been two measures to extend the life of the components. The difference is that the temperature rise of the white LED group is restricted, and the natural resin package is used.
However, in fact, the high-power LED is more than ten times higher than the low-power LED, and the temperature rise will cause the flash rate to drop significantly. The specific internal substantive significance is to reduce the thermal impedance of the chip to the package, to limit the thermal impedance of the package to the printed circuit board, and to improve the smooth and smooth heat dissipation of the chip.
Find ways to reduce thermal impedance and improve heat dissipation
The flash rate of the associated LEDs, improved chip structure and package structure, can be achieved at the same level as low power white LEDs. In view of the lighting fixtures and LED packaging manufacturers such as Lumileds and Toyo CITIZEN, and a simple heat dissipation technology for developing high-power LEDs, CITIZEN started to make white LED sample packages in 2004, which can be thicker without special technology. The calorie of the ~3mm heat sink is directly discharged to the outside. According to the CITIZEN report, the 30K/W thermal impedance of the junction of the LED chip to the heat sink is larger than the 9K/W of the OSRAM, and the room temperature increases the thermal impedance by 1W at room temperature. Left and right, even if the traditional printed circuit board has no cooling fan forced air cooling, the white LED panel can also be used in conjunction with lighting.
The special properties of the relevant flash average, it is generally believed that as long as the liquid concentration average of the phosphor material of the white LED is improved and the manufacturing technique of the phosphor is used, it should be able to overcome the above-mentioned siege and disturb.
Because the increase in power will cause the thermal impedance of the package to drop rapidly below 10K/W, because this overseas industry has previously developed high-temperature resistant white LEDs, intending to improve the above-mentioned problems.
To use the 1.25mm Ribbon Connector, you will need to first ensure that the ribbon cable is properly aligned with the connector. The pins on the connector should be lined up with the corresponding holes on the ribbon cable. Once the cable is properly aligned, you can then insert the connector into the corresponding socket on the device.
Overall, the 1.25mm Ribbon Connector is a reliable and versatile connector that is widely used in the electronics industry. Its high-density design and compatibility with ribbon cables make it an ideal choice for many applications
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