ST offers a large portfolio of energy-efficient DC/DC powered LED drivers for general lighting, display LED backlighting, automotive exterior and interior lighting,RGB and monochromatic LED drivers for signage and traffic signals. Ideal for both parallel and series configurations, they enable high ...
AC LED drivers are typically used with bulbs that already contain an internal driver that converts the current from AC to DC, so an AC LED driver's job is to register the low wattage of LEDs and step down the voltage to meet the bulb's voltage requirements, usually 12 or 24 volts.
An LED driver without a traditional sense resistor obtains higher efficiency when an already present MOSFET in the power stage is used to sense the LED current. This simplifies the circuit by removing the sense resistor component, allowing the LED a connection to ground — gaining better thermal relief and longer lifetime.
Calculating and Optimizing Efficiency in LCD Backlight Drivers Cecilia Reyes, Sheng Jin ABSTRACT Backlight displays have become the largest power consumer in mobile devices and personal electronics. When selecting components for an LED driver, efficiency is the most important consideration. The five
An LED requires a minimum voltage before it will turn on at all. This voltage varies with the type of LED, but is typically in the neighborhood of 1.5V - 4.4V. Once this voltage is reached, current will increase very rapidly with voltage, limited only by the LED's small resistance.
Due to the inherent loses in the bulb the lamp efficiency will always be less than the LED efficiency depending on the design. This includes thermal effects, driver losses and optical inefficiencies which all combine to reduce the overall efficiency of the LED bulb or luminaire compared to the internal LED package or chip.
Helvar's efficient LED drivers are designed to consume less energy and bring cost savings for applications where powerfull light output is needed. In combination with Helvar's first class design technology, the drivers can provide greater efficiency of 0.93 – 0.96.
LED Driver ICs High-brightness LED drivers are integrated circuits that are optimized to efficiently drive strings of high-brightness LEDs. Maxim's continually expanding portfolio includes products covering the full range of efficient switch-mode topologies (step-down, step-up, SEPIC) as well as some linear LED drivers.
The energy efficiency of LED products is typically characterized using efficacy, which in basic terms is the ratio of power input to light output—or more technically, emitted flux (lumens) divided by power draw (watts).1 For such a simple concept, however, there are several important nuances that must not be overlooked.
Efficiency in conversion of energy to light is important in LED use, as that is what differentiates LEDs as a viable light source. The amount of input power to LED brightness is the measure of efficiency in LED drivers. There is an inverse relationship between the reference voltage of the power supply and the LED brightness.
Engineers and designers in the LED lighting industry, often refer to two types of concepts for electrical efficiency LED lighting. It is important to recognize and understand the difference between both types. Energy efficiency pertains to the ratio of light to heat produced by the LED lamp.
power factor for LED drivers will be displayed on the type label as follows: λ = 0.95 The efficiency of a device is defined using its power efficiency value η. The power efficiency factor of a device is defined as the output power P divided by the input power P in. The respective measuring procedure for LED drivers will be defined in the IEC
Currently available LED drivers are typically about 85% efficient. So LED efficacy should be discounted by 15% to account for the driver. For a rough comparison, the range of luminous efficacies for traditional and LED sources, including ballast and driver losses as applicable, are shown below. Light Source Typical Luminous Efficacy Range in lm/W
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Furthermore, this paper provides actual examples of LED module failure modes that cannot be addressed via the use of LM805 data, or calculations via the TM216 method, therefore demonstrating the risks faced by OEMs when the reliability of an LED module is not considered in a manner as thorough as applied by the Philips LED module reliability ...
However, LED lamps require an electronic LED driver circuit when operated from mains power lines, and losses from this circuit mean the efficiency of the lamp is lower than the efficiency of the LED chips it uses. The most efficient commercially available LED lamps have efficiencies of 200 lumens per watt (Lm/W).
Abstract: Providing power to drive high-brightness LEDs (HB LEDs) can be achieved by a number of different schemes. Because many systems are battery powered, energy efficiency is key to maximizing each battery charge and the system's operating time. By improving battery efficiency you also improve the system's "green" footprint.
LED Street Lights' 3 Types of Efficiency. LED Chip Efficiency; A LED chip is the main component of LED, which converts the electrical energy into the light with Monocrystalene being the key material. LED chips can be either high-powered or low-powered, color green, red or blue, square or wafer, and 8mil, 9mil, 12mil, 14mil, etc. in size.
LED lighting has the potential to be more energy efficient than any other known lighting technology. But, two aspects of energy efficiency are important to consider: the efficiency of the LED device itself (source efficacy) and how well the device and fixture work together in providing the necessary lighting (luminaire efficacy).