Determine different applications in different LED driving method:
 
    Linear regulator to convert the voltage will face power problems, the switch means there are noise issues, LED driver the choice of conversion depends on what kind of application.
- Bill Rypka Bill Rypka Muzahid Huda Maxim HB LED Driver Product Marketing Manager
Conversion mode which

Through the linear regulator to convert the voltage will face power problems, this approach is more suitable for enterprises that need to avoid the noise (such as car audio) and therefore could not switch mode converter circuits. The switch mode is characterized by very high conversion efficiency, but it also has noise, so the choice of conversion depends on what kind of application.

Typically, the efficiency of charge pump-driven approach will change with the input voltage changes in the voltage range of large applications, their efficiency is relatively low; changes in the voltage range of applications is relatively small, only when the input and output voltage of the is a multiple of the relationship between the whole, it can achieve maximum efficiency, but the practical application in battery-powered difficult to achieve. Contrast, the conversion efficiency is not affected by inductive voltage interfere with, the application limit is less than the charge pump, so the current conversion circuitry to use more inductive approach.

How do you assess the performance

An objective that the evaluation performance HB LED driver IC according to different application point of view, can not be generalized. Decorative lamps in applications such as RGB color changing control requirements of high, this performance will become key indicators, and in the monochrome application does not require this. Another example is a narrow space applications require that the thermal dissipation capability; automotive lighting applications, both alternatives require the original circuit system with smooth combination of performance also requires high reliability; in NB-like display applications, the multi-string LED Brightness control requirements of a balanced driver IC for each one on the road to have precise control of current, such as the Maxim's products control accuracy can reach 3%; projector applications requires an efficient drive circuit, the ability to quickly adjust the brightness, as well as thermal protection capacity; in alternative applications, the performance is more reflected in the entire program rather than a single driver IC's. In general, the device integration, control the quantity, response speed, fault diagnosis, evaluation of performance of heat are all for reference.

Typically, the high level of integration aims to improve performance, but in high-power, the high level of integration in order to meet the high current will increase chip area, while intensifying the cost of heat, while also facing the problem, therefore, how to balance the power and integration of the The relationship between the driver IC design facing the issue. To improve the driver IC chip technology to meet the cost, while improving packaging to solve thermal problems.