LED Lighting Solutions
48Pages

Table of Contents INTRODUCTION AC-DC LED Technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Driver Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 PORTABLES Low-Voltage Portable LED Driver Topologies . . . . . . . . . . . . . . . . . . . . . . . . . . . Charge Pump Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Inductive Boost and Buck Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Linear Topology . . ....

INTRODUCTION LED Technology As the technology and light output of LEDs continues to improve, applications for color and white high-brightness LEDs are expanding into entirely new markets. Once primarily used as indicators, LED cost and performance levels have improved dramatically, allowing them to displace incandescent and fluorescent light sources in automotive applications, consumer electronics ranging from cellphones to LCD-TVs, architectural lighting, and general lighting. Over the next few years, LEDs will continue to transform the lighting marketplace with new and innovative solid...

Low-Voltage Portable LED Driver Topologies White LED and RGB tricolor LEDs are widely used for backlighting small color LCD panels and keyboards, as well as indicators. High brightness LEDs are used as flash light sources in cell phones and digital cameras. These applications require optimized solutions which can maximize battery lifetime, as well as minimize the PCB area and height. ON Semiconductor has a variety of solutions L VIN 2.5 to 5.5 V C1 2.2 μF 10 μH VIN using linear, inductive, and charge pump topologies. The inductive solution offers the best overall efficiency, while the...

PORTABLES Charge Pump Topology Patented Quad-Mode® adaptive fractional charge pumps take LED driver performance to a new level by offering a 10% efficiency improvement and up to 65% smaller packaging, without the need for an additional capacitor. Quad-Mode LED drivers deliver the high efficiency levels normally associated with inductor-based LED drivers, while eliminating the associated high-profile inductors and unwanted EMI. Most charge pump LED drivers offer three modes of operation corresponding to the ratio of the output voltage to the input voltage: 1x, 1.5x and 2x. The Quad-Mode...

Charge Pump/White and RGB LED Drivers — for LCD Backlight, LED Flash/Torch and Indicator (cont.) PORTABLES Input Voltage Range (V) Number of Outputs Total Output Current (mA) CAT3647 2.2 - 5.5 3 100 CAT3612 3.0 - 5.5 2 CAT3224 2.0 - 5.5 2 300 4 A Flash, 400 mA Torch NCP5612 2.7 - 5.5 2 CAT3661 2.0 - 5.5 NCP5603 Device LED-LED Charge Pump Current Regulation Operating Matching, Mode Mode Typ 1x / 1.33x / Current ±1.5% 1.5x / 2x Current 1x / 1.5x ±3% Dimming Method Operating Number of Quiescent Current Level/ Current, Typ Profile (mA) Shutdown Current, (mA) Notes Single Wire 32 1 1 max TQFN–16...

PORTABLES Inductive Boost and Buck Topology Inductive-Boost White-LED Drivers — for Backlighting and Torch/Flash Applications Device Input Voltage Range (V) Max Output Volt, Typ (V) Output Current (mA) Condition Number of LEDs/ Configuration Switching Mode/ Dimming Frequency Method Efficiency (%) Operating Quiescent Shutdown Current, Typ Current, Typ (mA) (mA) Package Notes • Flash/Torch • Internal synchronous rectification 1.0 - 5.0 5 800 Vout 3.3 V, Vin 2.5 V 1 for flash PFM, up to 1.2 MHz PWM 94 1.3 µA 0.05 DFN-10 CAT37 2.5 - 7 20 20 Vout =10.8 V 1 to 4 / Series 1.2 MHz PWM 84 0.5 1...

Enabling Energy Efficient Solutions Linear Topology_ • Dimming via 1-wire EZDim interface with 32 levels of dimming control • 25 mA fixed current (B versions) or adjustable current (A versions) • Zero current shutdown (< 1 [xA) • No switching supply noise • Tightly matched current LED sinks • Ultra-low headroom current sink • Low profile micro packaging • Mobile handsets • Still and video cameras • Portable gaming • Portable medical devices Linear White-LED Drivers for LCD Backlight

LEDs for camera phones, smart phones, and XENON bulb replacement, are scaling up in light output to meet the needs of higher performance camera imagers. 1 µF VIN (2.5 to 5.5 V) 1 µF Flash Current, A 0.5 CAT3612 Charge Pump 0.3 CAP RC RF 261 kΩ 0.55 F LEDB TORCH 826 kΩ CAP Dual-Cell Supercapacitor LEDA FLASH CAT4134 Dual Channel Inductive Boost 1 µF BAL FLAG CHRG CAT4131 Inductive Boost 1.5 CN CAT3224 CAT3224 Charge Pump 4.0 CP VIN GND RT 562 kΩ 2A 2A GND Brightness Camera Flash and Torch Light-Dedicated LED Drivers Topology Input Voltage Range (V) Output Current Output Package CAT3224...

Multifunction LED Drivers PORTABLES Multifunction LED Drivers Device LV5219LG LV5231CS LV5207LP LV5216CS Function* T, SB, RGB F, MB, RGB MB, RGB MB, RGB Main Backlight LED Driver 6-Ch (3/4/5-Ch Avail) 6-Ch (4/5-Ch Avail) 4-Ch (3-Ch Avail) 6-Ch (3/4/5-Ch Avail) Sub Backlight LED Driver 2-Ch — — — RGB LED Driver 1 RGB LED Driver 2 External Control R,G,B R,G,B Independent Independent ON/OFF ON/OFF Auto Blinking 4 R,G,B R,G,B Independent Independent ON/OFF ON/OFF 4 — R,G,B Independent ON/OFF — 4-Ch 4 Serial Control Topology Package • 17 LED channels total • LED current programmable – MB, SB,...

ADDRESSABLE SIGNAGE Addressable signage and architectural lighting make wide use of LEDs utilizing the broad range of available LED colors and their long operating lifetime. In architectural lighting, the use of LEDs allows vivid colors in lighting facades and enhancement of structural details. In moving signage applications, information can be updated in real time traffic displays, video images, and advertising. ON Semiconductor offers a series of linear solutions that can accurately regulate LED current and have programmable interfaces to allow software control. LED Controllers Vin (V)...