Linear regulators to convert voltage will be faced

by:Getian     2020-07-28

What LED drive conversion method

Through the linear regulators to convert voltage will be faced with a power consumption problem, this method is suitable for the need to avoid noise (such as car audio) and therefore cannot use the switch the transformation of the way of circuit. And switch the characteristics in the ways of conversion efficiency is very high, but it also has the problem of noise, so choose which the switch pattern depends on what applications.

Usually, the charge pump drive the efficiency of the way with the change of the input voltage and change, change in voltage range of application, the efficiency is low; And in voltage range change small application, only when the input and output voltage is between the multiple relationship between, it can achieve maximum efficiency, but that in the practical application of battery power it is difficult to achieve. In the inductance of the conversion efficiency don't be voltage interference, application restrictions also less than the charge pump, so the conversion circuit used more inductance way.

How to LED driving performance

Objective said, led drive IC performance according to different applications to see, cannot treat as the same. Such as adornment lamps in the application of RGB color change control requirement is high, and the performance is become main index, and does not require the application in monochrome this. And as the application requirement of narrow space is hot scattered ability; Automotive lighting alternative application requires both with the original circuit system of the combination of the smooth performance also requires high reliability; In the display applications such as nb, to string together led luminance equilibrium the control requirements of the driver IC to every one of the current way to have the precise control, such as maxim product control precision can reach 3%; The application of the projector is high needs driving circuit, quick to adjust the brightness of ability and thermal protection ability; In the alternative applications, the performance is reflected in the more the whole scheme and not a single drive IC. General look, device levels of integration, the control quantity, response speed and fault diagnosis, heat is the performance of the price of the reference.

Usually, high integration aims to increase performance, but in high power, high integration in order to satisfy large current would increase chip area, in increasing costs at the same time also face the problem of heat, so, how to balance the relationship between the power and integration is drive IC design face subject. Drive IC to improve chip in process to match costs at the same time, improve encapsulation solve the problem of heat.

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