Boost is an important task of LED driver circuit, and inductor boost and charge pump boost are two different topology modes.
'Because LED is driven by current, and the efficiency of inductance in current conversion is * high, the great advantage of inductance boost mode * is high efficiency, which can exceed 90% if properly designed;
However, its disadvantage is also obvious, that is, the electromagnetic interference is very strong, and the system requirements for communication products such as mobile phones are very high.
With the emergence of charge pump, the efficiency of the boost mode using charge pump will be lower than that of inductor boost.
Whether in lighting applications or backlight applications, improving the conversion efficiency of the drive circuit is a problem that product designers must face.
Improving the conversion efficiency is not only conducive to prolonging the standby time of portable products, but also an important means to solve the problem of LED heat dissipation.
In the field of lighting, it is particularly important to improve the conversion efficiency due to the use of high-power LED.
In addition to meeting the safety requirements, the LED drive Circuit should have two basic functions: first, keep the constant current characteristic as much as possible, especially when the power supply voltage changes by 15%, it should still be possible to keep the output current within 10%.
The main reasons are: 1. Avoid driving current exceeding * large rated value, affecting its reliability.
2. Obtain the expected brightness requirements and ensure the consistency of brightness and chromaticity of each LED.
Second, the LED driver circuit should keep its own power consumption low, so as to keep the system efficiency of LED at a high level.
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