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what is LED driver​

Date:2016-05-06

At present, the light emitting diode driver chip can be divided into: constant pressure type drive chip, constant current drive chip and pulse type drive chip. Among them, the constant pressure type drive chip is generally our common DC/DC boost chip is in the majority. The advantage of this scheme is that the chip cost is cheaper without complex peripheral circuits. But only constant voltage drive LED will cause the output of the drive circuit is not controllable. Can not guarantee the consistency of LED brightness.


The constant current driving chip solves the problem of the current is not controlled by the constant pressure type. The current relatively good constant current chip can achieve about 1% of the constant current accuracy, and there is a simple peripheral control interface can be flexible to set the required output current size, so much welcome. But the price of this kind of chip is much higher than the price of the constant pressure chip and the peripheral circuit is complex. At the same time because of constant output current so the entire chip in the battery as the power of the discharge will be relatively fast.


At present, the pulse type driving chip is powered by the high frequency pulse generator output interface to the LED lamp. Because it is a pulse signal frequency is very high so the human eye cannot feel led stroboscopic, so this way that is in line with the vision and on the one hand effectively save the electrical energy output. And the working frequency of this type of chip can be controlled by the external interface. But at present, the type of chip oscillation frequency is generally in the range of 100KHz~500KHz. So the current drive capability is only suitable for small power applications. But I believe that in the near future will be raised to a high power LED driver occasions.


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