LED linear downlight is a kind of lighting through the embedded into the ceiling under the light of the lighting. Belonging to the directional lighting, only its opposite surface can receive light, its advantage is more than ordinary lighting fixtures, often used for general lighting or auxiliary lighting. With the continuous development of LED technology, the current life of LED linear downlight generally can reach more than 50000 small.
LED linear downlight energy saving, environmental protection, dimming, LED Linear Down Light low energy consumption, long life and other characteristics of people familiar and loved, but in the LED linear downlight, there is an easy to be overlooked an important part of the LED Linear downlight power supply.
1 new modular power supply: Boost DC / DC converter efficiency is high but the ripple and noise voltage is large, low dropout linear regulator low efficiency but the smallest noise, LED Linear Down Light the combination of the two components of the dual output power IC can be better To solve the problem of efficiency and noise.
2 output voltage accuracy: the general output voltage accuracy of ± 2 ~ 4%, there are many new power IC accuracy of up to ± 0.5 ~ ± 1%; LED Linear Down Light and the output voltage temperature coefficient is small, usually ± 0.3 ~ ± 0.5mV / ℃, while some can reach ± 0.1mV / ℃ level. Linear adjustment rate is generally 0.05% ~ 0.1% / V, some up to 0.01% / V; load regulation rate is generally 0.3 ~ 0.5% / mA, some up to 0.01% / mA.
3 low operating voltage: general LED linear downlight power supply operating voltage of 3.0 ~ 3.6V. There are some operating voltage lower, such as 2.0,2.5,2.7 V, etc .; LED Linear Down Light there are some operating voltage of 5V, there are a few 12V or 28V special purpose voltage source.
4 perfect protection measures Power: a sound protection measures, including: output overcurrent limit, overheating protection, LED Linear Down Light short circuit protection and battery polarity reverse protection, so that the power supply safe and reliable, easy to damage.
5 package size: In recent years the development of LED linear downlights are used SMD devices, power IC is no exception, mainly SO package, SOT-23 package, μMAX package and package size of the smallest SC-70 and the latest SMD Packaging, etc., so that the power supply space is getting smaller and smaller.