LED view of the United States - highlighting the current king

Bright LED is still the mainstream application

LED lighting has been a hot topic in recent years, the current development although there are still several major bottlenecks to be overcome, but there is a trend of future public lighting and lighting to replace analog and power, the manufacturers will not miss this opportunity, LED drive has become the most important analog manufacturers a product line.

Because of cost, heat and life and other reasons, we see that despite the high voice, good vision, LED lights off into Home Furnishing still have a long way to go. At present, the largest market for LED lighting is still in the public lighting, which determines the development trend of the highlight LED lamp. The company launched a comprehensive product line for this application to meet the diverse needs of different customers.

Company HBLED product line manager PieroBianco

LED drive technology challenges

Currently exist on the market of LED lighting, according to the input mode is divided into two categories, namely DC input and AC input type two, DC input type refers to the built-in battery or other DC power supply occasions, AC input is usually refers to the use of city power. LED driver for different input methods to face different technical challenges.

Company HBLED product line manager PieroBianco pointed out that for the DC input driver, the challenge and the design of DC-DC converter, including compensation control loop, to solve the noise problem, to reduce costs as much as possible, and also affect the efficiency of the thermal management is a key consideration for the design of drive; AC input, up to some of the more complex, because the AC input itself is responsible for, the higher the voltage, noise of flyback converter is higher. In addition, there is a lot of effort to meet the requirements of EMI, THD, PFC, dimming and matching with electronic transformers. Piero further pointed out that to be a good solution to light and electronic transformers and matching problems, the most important thing is to choose the right drive products.

Beautiful letter to give you the perfect solution

Here, the company application engineer Xu Bin told us more in-depth exchanges of the circuit environment lighting work, also let us understand the complex application and technical challenges facing the LED drive. Lighting applications usually include an electronic transformer, the city will be converted to the light of the low-voltage power supply. And this kind of electronic transformer is designed for the traditional halogen lamp, has certain requirements to the load, the traditional halogen lamp usually power is larger, the load is strong, can easily start electronic transformer. The LED lamp power is much smaller, especially when a dimming function LED lamp brightness down, it produces load and electronic transformers do not match, can not start the electronic transformer, causing the circuit to be unable to work or frequent blinking lamps. Most of the existing LED driver solution is to achieve a AC-DC and a standard DC-DC together, this program can not effectively solve the problem of the above mismatch, it is easy to cause flicker. The United States and the company launched a series of LED driver solution, by using the traditional LED driver chip PFC effectively solve the mismatch problem, its PFC parameters to reach more than 0.9 of EU standards.

Dimming and solve the matching problem of electronic transformer is Maxim LED drive the largest specialty products. In addition, the United States and the United States LED drive products are also available to the user a variety of design options, including compatible digital and analog dimming, optional electrolytic capacitors to achieve different users of the lamp life and dimming performance trade-offs. For different applications, there are different products to meet some special application requirements, as for MR16 lamp MAX16840 integrated switch MOSFET, reduce the required number of periphery components, the standard TDFN3*3-10 package has good heat dissipation performance, ensure the luminous efficiency, does not need the electrolytic capacitors, prolong the service life of the lamp for motor vehicle headlights; MAX16833 has the good characteristic of frequency jitter, compatible step-up and step-down mode, suitable for automotive applications 65V input, LED and driving the single wire connection, reduce the cost of wires and connectors, and short circuit protection function; used in automobile rear MAX16839 is a low cost linear actuator, with good EMI characteristics, timely monitoring of error signal including open circuit, short circuit, timely shutdown circuit to protect the lamp.