How does backlighting work in portable device displays?
Backlighting in portable device displays has historically uti-lized difficult-to-power cold cathode-fluorescent (CCFL) tubes. The tubes run on alternating current (AC) and need a large initial voltage of typically greater than 1 kV in order to fire them. Once they have fired, their operating voltage drops to under a kV.
Why do you need a backlight LED-driver?
Many of today’s portable electronics require backlight LED-driver solutions with the following features: direct control of current, high efficiency, PWM dimming, over-voltage protection, load disconnect, small size, and ease of use.
Why do LED drivers need a ballast resistor?
Driving LEDs in parallel requires a ballast resistor in each LED string, which leads to lower efficiency and uneven current matching. Battery life is critical in portable applications. For an LED driver to be useful, it must be efficient. An efficiency mea-surement of an LED driver differs from that of a typical power supply.
What is a LED backlight & how does it work?
LEDs operate at low voltages of 3V TO 4V each and are extremely durable. They produce a brighter light whose spectral content can be more easily custom tailored to the needs of the backlight. Their brightness can be easily controlled to compensate for changes in ambient light.
What packages does lp8556 come in?
The LP8556 device is available in two packages: DSBGA and QFN. TI recommends the QFN package for its thermal dissipation and large current capability, and it is the package used in this reference design. Additionally, LP8556 has various EPROM versions to differentiate configurations with many features.
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ON Semiconductor''s LED driver solutions for different low …
Choosing the right light-emitting diode driver solution for low-voltage portable device backlight or flash applications is a challenge for designers, because they have to consider extending battery life while reducing printed circuit board area and height.Currently, white LEDs and RGB tri-color LEDs are mostly used in small LCD panels and keyboard backlight and indicator applications; …
Learn More →Analysis of Diversified LED Backlight Market Demand and …
Driven by more and more emerging demands and green energy-saving trends, the application of power supplies and power management technologies that can improve power efficiency will grow rapidly, and backlight is a typical application demand. Although the backlight source of LCD TVs is still mainly traditional cold cathode fluorescent lamps (CCFL), with the global awareness of …
Learn More →CCFL to LED Conversion Power Supply User Guide
CCFL to LED Conversion Power Supply National Semiconductor RD-169 Product Applications Design Center November 2008 1.0 Design Specifications Inputs Output #1 VinMin=8V Vout1=20V VinMax=16V Iout1=0.06A 2.0 Design Description Better backlight displays for portable devices - Two-Channel 60 mA Backlight LED Driver Design
Learn More →DC-DC Converter for Smart Lighting Applications
Many portable LED applications require dimming. In applications such as LCD backlighting, dimming allows adjustment of brightness and contrast. PWM dimming is achieved by applying full current to the LED at reduced work cycles. The frequency of the PWM signal must be higher than 100 Hz to ensure that the PWM button is not visible to the human eye.
Learn More →How to select LED driver for low voltage portable device backlight …
White LEDs are widely used in small liquid crystal display (LCD) panels and keyboard backlight and indicator applications. High brightness LEDs are used as flash light sources in mobile phones and digital cameras. These applications require optimized driver solutions that can extend battery life and reduce printed circuit board (PCB) area and height.
Learn More →High Current Accuracy Backlight and LCD Bias Reference …
LED backlight supply 12 V 5 V LCD Display Panel TIDUE80–October 2018 1 ... The TPS65132 family is designed to supply positive/negative driven applications. The device uses a single ... The device provides a high efficiency and small size power solution for portable equipment. The TPS61089 features wide input voltage range from 2.7 V to 12 V ...
Learn More →High Efficiency Backlight LED Driver
Simplified Application Circuit High Efficiency Backlight LED Driver General Description The RT4532 is a high-efficiency LED driver for backlight applications. An asynchronous boost converter with an internal Schottky diode and a current source driver are designed to support 6LED/channel with wide input voltage range from 2.5V to 5.5V.
Learn More →LED 7-Segment :: LED in portable products backlight status
Application of LED battery power supply LED in portable products backlight status LED light emitting diode products Voltage and current of LED To adjust the LED brightness Important task of LED drive circuit LED display and traditional LCD LED chip lamp bead ...
Learn More →How to Choose the Right Power Supply for Your LED ...
However, the importance of driving LED lights with a defined current has pushed LED power supply manufacturers to develop comprehensive ranges of constant current (CC) power supplies, such as the VLED15-230-350 unit from CUI Inc. shown in Figure 3.
Learn More →Diversified solutions for backlight applications
Driven by more and more emerging demands and green energy saving trend, the application of power supply and power management technology that can improve the energy efficiency of power supply will grow rapidly. Backlight is a typical application demand.
Learn More →Texas Instruments Incorporated LED-driver considerations
Many of today''s portable electronics require backlight LED-driver solutions with the following features: direct control of current, high efficiency, PWM dimming, over-voltage …
Learn More →LED Drivers | Richtek Technology
LED Drivers. Richtek offers an extensive portfolio of LED drivers that delivers high performance and precise dimming control, which are widely used in various applications, such as LCD panel backlights, flashlights, camera lighting and more. We also provide design tools and technical resources to accelerate your design time.
Learn More →Design requirements for mobile phone LED backlight power …
Mobile phone backlight is one of the largest application markets for LEDs today. As the market is already saturated, prices have dropped significantly. Although sales volume continues to increase, sales value has not grown significantly. Despite this, the backlight application of 5 to 10-inch mobile phone devices will continue to be a new driving force for …
Learn More →Everything about LEDs: Basics of High Power LED …
An LED Driver is an electrical device that regulates the power to an LED or string(s) of LEDs. The driver responds to the changing needs of the LED by supplying a constant amount of power to the LED as its electrical …
Learn More →High Current Accuracy Backlight and LCD Bias Reference …
The device provides a high efficiency and small size power solution for portable equipment. The TPS61089 features wide input voltage range from 2.7 V to 12 V to support …
Learn More →LED Drivers & Power Supplies
LED drivers and power supplies offer versatility in lighting design, allowing for dimming control and flexibility in light intensity and color. Future Developments in LED Driver and Power Supply Technology. LED driver and …
Learn More →OB3375 Datasheet(PDF)
The performance of LED backlight power supply for LCD backlight application is presented. It is designed with OB3375 which integrates a buck converter. The detailed, schematic, BOM, PCB layout ... This data sheet is applied to the LED …
Learn More →UM1661-LED Backlight Boost Driver-Switching Regulators-Power Supply ...
The converter can operate from 2V to 6V, and capable of delivering maximum 200mA output current at 4-LEDs application with 3V input voltage. Quiescent current drawn from power source is as low as 120uA. All of these features make UM1661 be suitable for the portable devices, which are supplied by a single battery.
Learn More →Texas Instruments Incorporated LED-driver considerations
Battery life is critical in portable applications. For an LED driver to be useful, it must be efficient. An efficiency mea-surement of an LED driver differs from that of a typical power supply. An efficiency measurement of a typical power supply is defined as the output power divided by the input power. With an LED driver, the output power is
Learn More →LCD Backlight application using OB3379
The performance of LED backlight power supply for LCD backlight application is presented. It is designed with OB3379 which integrates a buck converter. The detailed, schematic, BOM, PCB layout and test data are also described. The test data in this report is by White LED array. Revision History Revise Date Version Reason/Issue
Learn More →High Efficiency Backlight LED Driver
Simplified Application Circuit High Efficiency Backlight LED Driver General Description The RT4532 is a high-efficiency LED driver for backlight applications. An …
Learn More →LED power management method for backlight applications …
Therefore, the optimal LED driver circuit design includes battery type, LCD characteristics, system power requirements and efficiency, LED driver IC and its external components, PCB layout …
Learn More →Introduction to LED Backlight Driving Techniques for Liquid …
This paper presents a LED backlight driving system for large-scale of LCD panels. High efficiency, high power factor, circuit simplicity, and low cost can be achieved by using a single-stage ...
Learn More →LED power management method for backlight applications …
Most portable electronic devices use white LEDs as backlight sources for small-size color LCD displays. These LED driver circuits are powered by batteries whose output voltage varies over time. Therefore, the optimal LED driver circuit design includes battery type, LCD characteristics, system power requirements and efficiency, LED driver IC and its external components, PCB …
Learn More →LCD Backlight application using OB3379 LD60V0.75A3
OB3379 Demo Board Board Model: LD60V0.75A3379.00 The performance of LED backlight power sup ... ON-BRIGHT - DEMO,DEMO BOARD,LDB40V0.4A1L_33510.00,OB33510,LCD MONITOR BACKLIGHT APPLICATION, 2016-10 ...
Learn More →80+ LED Projects and Circuits for Engineering Students
High Power 3-LED Bicycle Light: A high power bicycle light is designed here. This light can work in thunderstrom, snowstroms and in temperatures below -30 c. LED-Zeppelin: This project shows the designing of a game using leds. The game Zeppeline is named after its inverter. Led Projector Box: Here is project showing DIY LED projector.
Learn More →Mobile phone LED backlight power management design …
Mobile phone backlight is one of the largest LED application markets today. As the market is already saturated, prices have dropped significantly. Although sales volume continues to increase, sales value has not grown significantly. Nevertheless, the backlight application of 5 to 10-inch mobile phone devices will still be a new driving force for market growth.
Learn More →How2Power
This 3-page article discusses the features and characteristics that are valuable for LED driver ICs to have when they are used in portable, LED backlight applications. (See later sources for information on advanced driver IC features.)
Learn More →LED Lighting | Mouser
LED - Driving High Brightness LEDs in the General Lighting Marketplace By ON Semiconductor; ... Design Guideline on 150W Power Supply for LED Street Lighting Design Using FL7930B and FAN7621S; FAN5345 and FAN5346 in LED Applications; High-Power Factor Flyback Converter for LED Driver with FL7732 PSR Controller;
Learn More →AN65
The LCD displays currently available require two power sources, a backlight supply and a contrast supply. The display backlight is the single largest power consumer in a typical portable apparatus, accounting for almost 50% of battery drain with the display at maximum intensity. As such, every effort must be expended to maximize backlight ...
Learn More →Guide to LED Circuit Designs and LED Basics & Operation
The goal of an LED power supply is to provide a sufficiently high output voltage, and to force the same current through all LEDs connected in parallel. Note (Figure 5) that if all the white LEDs of a parallel configuration have identical …
Learn More →Power Supply and Topology Solutions for LED …
Figure 1: The LED driver in a multi-LED array configuration is the last stage in a power-supply chain that begins with the AC line (in most cases), goes through an optional lower-voltage DC/DC conversion stage, then …
Learn More →LED portable backlight application power supply solution …
White LEDs and RGB LEDs are widely used in small-size LCD panels and keyboard backlights as well as indicator light applications. In mobile phones and digital cameras, high-brightness …
Learn More →Optimizing Efficiency in White LED Backlight Applications
In portable applications with a single-cell Li-Ion source, the sum of the voltage drop across the white LED and the current source can be lower or higher than the battery voltage. …
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