The debugging techniques for the LED driver chip are mainly the following aspects. 1, chip fever This is primarily for high voltage driver chips with built-in power modulators. If the current consumed by the chip is 2 mA, the voltage of 300 V is applied to the chip, and the power consumption of the chip is 0.6 W, which of course causes the chip to generate heat. The maximum current of the driver chip comes from the consumption of the driving power mos tube. The simple calculation formula is...
Because it can provide high efficiency, durability, long working life, environmental protection and superior visual effects, LEDs have increasingly appeared in industrial applications, electronic signs and signals, home and mobile devices, automobiles and consumer electronics. Therefore, the driver design of these LEDs has also received attention. In theory, the LED's average working life exceeds 100,000 hours. But the premise is the need to choose the appropriate driver and circuit design,...
According to Business Wire, Arctic Sand Technologies, a leader in power conversion ICs, today introduced an ultra-efficient LED driver for the next generation of ultra-high definition ultrabook platforms. The ARC2C0608 reduces losses in LED drivers by approximately 50%, enabling high-brightness (400NIT) Ultra High Definition (UHD) LED-backlit displays to save more than 0.5W. The product is available in a very thin package solution with dimensions up to 1mm. The new IC features an integrated...
Every LED advertising vehicle driver in the process of driving, how many times it will inevitably appear several times violation tickets, just got a driver's license for new driver violations are also commonplace, because of hand-born and tense reasons accidentally Was photographed. In fact, as long as the rookie LED advertising vehicle driver is honest and regular driving, a lot of signs and road signs observed on the road, not speeding can not be reduced, you can reduce the number of eating...
FaIRchild Semiconductor (FaIRchild SemicONductor) announced the introduction of the linear LED driver product FAN5622 / 24 / 26, the new product for space-constrained applications requiring LCD display and keyboard lighting (such as mobile phones, blood glucose meters and other portable applications), compared to Other solutions can save up to 60% of board space. Fairchild's FAN5622 / 24 / 26 is designed to eliminate the need for additional passive components in the charge pump and series boost...
August 10, 2005 - BEIJING - Linear Technology introduces the LTC3208, a fully integrated 850kHz, low noise, high efficiency 1x / 1.5x / 2x charge pump multi-display LED driver. It can drive up to 17 LED current sources: a main display with 1 - 4 LEDs, a sub-display with 1 - 2 LEDs, a RGB display with 1 - 3 LEDs and a 1 - 4 LEDs Camera display and a 1 - 4 LED auxiliary display. The device is available in a compact 5mm x 5mm QFN package. Each display has its own dimming and digital control...
LED demand for flexible, integrated, networked driver electronics is getting closer and closer in 2011. For European OEMs, it means that the time limit for implementing ECE R87 is approaching. As early as in 2008, the European Union has announced that starting in February 2011, new cars and small trucks will be equipped with daytime running lights (DRL), and other trucks and buses will also be available on August 7, 2012. Audi's A8, R8 and A4 series have been equipped with LED daytime running...
Basically, it can be said that the main function of the LED driver is to convert the input AC voltage source to an output voltage that can follow the LEDVf (current source with a positive conduction voltage drop. As a key component in LED lighting, the quality of the LED driver directly affects The reliability and stability of the overall luminaire.From the LED drive and other related technologies and customer application experience, this article collates and analyzes many failures in the...
Linear Technology announces the LT3519, a 45V, high side current sense DC/DC converter designed to drive high current LEDs. The LT3519's 3V to 40V input voltage range makes it ideal for applications such as automotive and industrial lighting. The combination of an internal 45V , 750mA switch, Schottky diode and internal compensation provides a highly compact LED driver solution. The LT3519 can drive up to ten 100mA white LEDs from a 12V input, making it ideal for a variety of applications such...
LED general lighting design engineers face many challenges such as power density, power factor correction (PFC), space limitations, and reliability. These LED lighting design challenges are similar to power supply design challenges. Specifically, LED general lighting has several challenges: because of the total light efficiency requirements and thermal limitations, even low-power applications are important; in many cases, Low power also requires power factor correction and harmonic processing;...
In recent years, LED as a new energy-saving light source has won high investment enthusiasm and great attention in the world and China, and penetrated from the outdoor to the indoor lighting application market. China has also emerged tens of thousands of LED lighting companies. The main reason for letting LED lighting shine is its energy-saving, environmentally friendly, long-life, easy-to-control, maintenance-free features. However, it is ironic that we often hear that the LED lighting power...
Some multi-string LED modules use a common anode configuration; however, this common anode connection reduces the number of wires between the LED module and its driver from 2N to N+1, where N is the LED string in the module. Number of. This article will clarify how to drive such a common anode LED module and simultaneously limit the LED string voltage when an LED string changes to an open state. Figure 1 shows the LT3496 triple output LED driver in buck mode configuration where the LED string...
Using a simple resistor to limit the current in the LED string seems to be the most economical and simple, so why bother with the linear driver IC? In fact, the benefits of linear drives are many, including: ● Avoid using complex, expensive devices (compensating for changing forward voltages requires different types of resistors). The brightness is adjusted by pulse width modulation (PWM). ● Reduced system cost due to the unstable system power supply. ● Reduced board space required. ● Increased...
Several errors that are easy to make in LED circuits: For the novice, LED driver design is actually not an easy task. In this regard, Xiaobian specially summarizes some of the problems that design people need to pay attention to at work and personal design experience to share. Do not use bipolar power devices Since bipolar power devices are cheaper, generally about 2 cents, some designers use bipolar power devices to reduce the cost of LED driving, which will seriously affect the reliability of...
1, chip fever This is mainly for high-voltage driver chip with built-in power modulator. If the chip current consumption of 2mA, 300V voltage added to the chip above the chip's power consumption of 0.6W, of course, will cause the chip fever. The maximum current of the driver chip comes from the consumption of the driving power MOS tube. The simple calculation formula is I = cvf (Considering the resistance effect of charging, the actual I = 2cvf, where c is the cgs capacitance of the power MOS...
In the global light bulb market, the amount of appetite is 20 billion. After the incandescent lamp was put on production and the ban on sales in 2012, although the popularity of energy-saving fluorescent lamps (CFL) still prevailed, the global environmental awareness was high. Light-emitting diodes ( LEDs ) have become a national policy, and LED bulbs will be one of the first products to be introduced in lighting projects driven by many countries. The market regulator estimated that the LED...
Summarize this period to make lighting drive power to improve efficiency tips: 1. Main current loop PCB as short as possible. LAYPCB experience, and layout, this is nothing, the quick way is to see more works of manufacturers. 2. Optimize the transformer parameter design to reduce eddy current losses caused by ringing. This is more difficult, we must first grasp the basic electromagnetic theory, design a reasonable transformer, the most important thing is patience, even if it is to think of can...
As the panel industry vigorously cultivates its LED driver IC factory, accelerates the trend of the LED driver IC industry, Evergrande, and the domestic LED driver IC industry, with the rapid expansion of market share, the foreign semiconductor industry and small factory survival space will Compressed, how to break through will test the business intelligence of each factory. In order to expand the business map, domestic Chi Mei and AUO two panel faucets not only supply panels to LED backlight...
With the gradual recovery of the LED industry in 2013, LED lighting is showing a booming momentum in business areas, outdoor street lighting and other fields. Focusing on the further promotion and application of LED lighting, in many key links such as driver ICs, light sources, packages, and luminaire designs, many industry players are placing more energy-efficient and cost-effective solutions on the forefront of technological development. Andrew Smith, Senior Product Marketing Manager of Power...
Why LED displays can be widely used, my summary is the following: 1. Extensibility: The larger the LCD screen is, the higher the investment in the production line equipment. The increase in the size of the LED display is very easy, just like building blocks. The resolution is also convenient to implement according to user needs. 2. Full color: bulbs, neon lights, etc. are all monochrome, LEDs achieve a combination of RGB three primary colors. 3. High reliability: LED is solid lighting, high...
As part of the LED luminaire, the stability and reliability of the LED driver directly affects the life of the LED luminaire, which is compared to the "heart" of LED luminaires. It can be seen that LED drive power plays a pivotal role. At present, there are nearly 400 enterprises involved in LED drive power. The quality of the power supply is mixed and the market is chaotic. It is not easy to buy a reliable power supply in the market. Shouxu, the general manager of Shanghai Shouwei Power Co.,...
Recently, the Japanese factory Sharp said that the LED driver "IR2E65U" for large-size LCD panel LED backlights, such as LCD TVs that can drive 120 LED lights, will be delivered from October 1, 2009. The sample price is 250 yen and will be Mass production began on October 30, with an estimated monthly production of 600,000. It is reported that the input voltage range of this LED driver is 3.0-3.6V, the output current is 15-70mA/ch, the maximum output voltage is 45V, the operating temperature is...
LED driver IC manufacturers have accumulated to expand their product lines, and this year they will strengthen their LED lighting field. They will actively introduce new products and strengthen their product lines. For LED architectural lighting applications, the accumulation will also officially launch three channels of new 40V built-in power management functions. Constant current LED driver, mainly LED architectural lighting, LED curtain lights, LED light strips, LED signage advertising...
The LED is a solid-state light source. When a forward voltage is applied across the LED, the minority carrier and the majority carrier in the semiconductor are recombined, and the excess energy emitted will cause photon emission. Different materials can be used to make light emitting diodes in different colors. As a new light source, in recent years, major companies and research institutes have been in the ascendant in LED research, which has greatly improved their light efficiency. Lumiled has...
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