Tens of year come, ordinary glow diode (LED) been able to have adopted extensively in numerous applying, design personnel designs a requirement to be familiar with very much to its, so that most person can undertake thorough reflection to them not quite. Nevertheless, a kind of new-style high-power LED is rising abruptly, and newest technology progresses already the look people again focusing gives off light ordinarily at this on diode body.

The 10 ～ that the output of the 1W of new generation, 3W and 5WLED is standard LED output 50 times, this makes a lot of designs should are faced with to challenge when using these new-style LED to undertake designing, and the sheet with right choice piece machine drive is new-style LED also is a simple task no longer.

To show higher drive n demand, watch 1 listed the typical drive electric current of LED of 3 kinds of different high-power and voltage.

Fiducial, batteries detects and temperature monitoring has driver, voltage multiple choice, and proper peripheral combination depends on again a variety of elements.

The addition that outputs power the drive requirement that certainly will raised pair of LED. To get enough brightness, the LED of a 5W asks electric current of the drive when 7V achieves 0.7A. The standard LED that electric current of the drive when this compares requirement 1.4VDC wants 20mA only wants much taller.

Current, the refrigeration of diode is mechanical design is mixed the main problem that circuit board layout needs to consider. Temperature tubal core also can affect the output brightness of parts of an apparatus, because rise from environmental temperature when parts of an apparatus,arrive when 120 ℃ , brightness can drop amount to 35% . The temperature tubal core of LED also can affect the glow wavelengh of parts of an apparatus, in the temperature of 100 ℃ change issues wavelengh to be able to change 4~9nm almost.

To satisfy these special requirements, the power that needs some kind of form adjusts keep abreast of for new-style LED power supply a monitoring. In addition, if LED needs a basis,other and exterior input twinkles or dim go down, they still need a small-sized sheet piece machine will dominate power circuit. What need to do above all is to decide which kind of driver develop attack the structure is the most appropriate, decide which sheet next piece machine have appropriate peripheral.

Linear driver

Compare with any other high-power driver, design of high-power LED driver has outstanding linear control and efficient character. If need to control the brightness of LED, need linearization apparently very much. Although parts of an apparatus is not by batteries power supply, because the power driver of a few watt involves potential high temperature, efficient sex made the central point of attention.
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