In addition to meeting the safety requirements of the LED driver circuit, the other basic functions should be two aspects: As long as possible to maintain constant current characteristics, especially in the supply voltage ±15% changes, should still be able to maintain the output current in the range of ±10% changes.
The main reasons are:
1, to avoid driving current exceeding the maximum rated value, affecting its reliability.
2, to obtain the expected brightness requirements, and to ensure the brightness of each led, chroma consistency. Second, the driving circuit should maintain a lower power consumption, so as to enable the LED system efficiency to maintain a higher standard.