Semiconductor Leading LED innovation: the fourth drive technology

Introduction: At present, there are three LED driver technology that is resistive, linear regulator and HEF4053BP datasheet and switching regulator-type style. Of these techniques are insufficient. Recently, ON Semiconductor announced that leading the LED drive technology innovation, made the fourth drive technology ... ...

LED drive technology from the current point of view, mainly three techniques, namely, resistive, linear regulator and HEF4053BP price and switching regulator-type style. The coexistence of a variety of drive technology, used in different environments, each with advantages and HEF4053BP suppliers and disadvantages.

"Resistive drive technology is that the low cost, ease of design, there is no electromagnetic compatibility problems." Semiconductor Small Signal Standard Products Group, Director of Marketing and applications Asif Jakwanl explained, "but the drawback is dependent on the brightness of LED lights the battery voltage, and its brightness varies with the voltage, the potential danger is likely to LED lights burn out. In addition, its disadvantages include the need for appropriate LED is also encoded, the conversion efficiency is low, and the pressure on the stock to customers. " However, the resistance of low-cost and easy design-driven, is still belong to the more popular LED driver technology.

Then, Asif Jakwanl advantages and disadvantages of the other two techniques also provided a detailed explanation. For linear regulator drive technology, its advantages are ease of design, there is no electromagnetic compatibility problems, compared to resistance-driven, it also increased the steady flow and over-current protection with external current set point. But the drawback is the cost more expensive than the former, there will be power dissipation, the efficiency is relatively low. The third type is a switching regulator

become popular in recent years, straight to the drive technology, its high efficiency, LED brightness control, and voltage independent, but the drawback is cost a lot more expensive than the previous two, design complexity The biggest problem is the presence of electromagnetic interference. "Some applications are sensitive to electromagnetic interference, such as cars. For the car, the interference from the LED driver will affect the cars audio and video receiver, so switching regulator type may not be suitable for all applications." He said. However, in some cases, high-current applications, due to high efficiency switch driver, it is still the first choice.

"Taking into account the above advantages and disadvantages of three drive technology, ON Semiconductor through painstaking research, on the first and second technology improvements, proposed a new drive technology - linear constant stability pressure device (CCR). This drive is using ON Semiconductors patent-pending self-bias transistor technology, a wide range of regulators, to ensure a constant operating voltage range of brightness. design also with a negative temperature coefficient, in extreme voltage and temperature protection LED from thermal runaway effect. "Asif Jakwanl said.

Let us call it the fourth drive technology. "Ends and the three-terminal linear constant current regulator with respect to linear and switching regulators in terms of a simple and more cost-effective solution, but also significantly improved compared with performance of resistance." He said, "I was We Semiconductors patented technology, has applied for patent, is pending. "CCR resistance between the cost of the program and between the linear regulator.

CCR is characterized by steady flow, to support the maximum operating voltage 45V, especially for automotive taillights voltage instability. CCRs advantages include: wide voltage range of brightness is constant, the higher the input voltage to protect against over-driven LED effects LED when the input voltage is lower than the light, reducing or eliminating the LED code inventory (because there is no match different voltage LED light).

Compared with the switching regulator, because there is no switch, so there is no EMI problems, making the design simple. CCR is a double-ended drive, LED on top, the following may also make the design simple; also not around at the components, while the switching regulator will need more external devices. "CCR is a low cost of the line regulator. Also, because it eliminates the LED code and reduce the resistance of inventory costs, lower overall system cost." Asif Jakwan said.

Applications, Asif Jakwan proposal, 50mA the following, CCR is the best choice. When the need for large current, the switching regulator is still the better choice. Besides the above mentioned car LED lighting, commercial signage and architectural lighting applications are very suitable for CCR.

Two ends of the current products are available in a CCR, not two three-terminal device with adjustable end of CCR supplier of light.