MAX1910 White LED Charge Pumps - Maxim IC

Drives LEDs with a regulated output voltage or current (up to 120mA) from an unregulated input supply (2.7V to 5.3V). These are complete DC-DC converters requiring only four small ceramic capacitors and no inductors. 200mV Current-Sense Threshold Reduces Power Loss.

MAX1910 White LED Charge Pumps - Maxim IC

1.5x/2x High-Efficiency White LED Charge Pumps

Some Features

• High-Efficiency 1.5x/2x Charge Pumps
• Low Input Ripple with 750kHz Operation
• Up to 120mA Output Current
• 1µA Shutdown Current

Read More Here - White LED Drive Maxim at EEM

MAX1561 - 26V Step-Up Converters - Maxim IC

The MAX1561 and MAX1599 include an internal, high-voltage, low-RDS(ON) N-channel MOSFET switch for high efficiency and maximum battery life. A single DualMode input provides a simple means of brightness adjustment and on/off control.

MAX1561 - 26V Step-Up Converters - Maxim IC

"High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs"

Fast 1MHz (500kHz for the MAX1599) current-mode, pulse-width modulated (PWM) operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Programmable soft-start eliminates inrush current during startup.

Some Features -

• Accurate Current Regulation for Uniform Illumination
• High Efficiency Up to 87%
• 2.6V to 5.5V Input Range
• 0.3µA Shutdown Current
• 26V (max) Output with Overvoltage Protection
• Up to 900mW Output Power with Internal 30V MOSFET Switch

Why Drive White LEDs with Constant Current? - Maxim

Here you can understand how to drive white LED' s for flashlight or Internal lamp. I have tried substituting for tubelights and bulbs. These LED's are amazing. The amount of light at even 100mW is phenomenal. The future is indeed LED Lights. But more Amber component is required in LED to give the warm feeling of an Edison Lamp.

ICL8001G - Efficient LED Bulb Driver - Infineon

The highly efficient dimmable LED driver system utilizing ICL8001G sets a new Benchmark with respect to integration, performance, features and total system cost. ICL8001G employs quasi-resonant operation modes with integrated power factor control for off-line residential LED lighting applications in particular 40W / 60W / 100W incandescent bulb replacements.

Infineon ICL8001G - Bulb Driver

The EVAL-LED-ICL8001G-Bulb02 demonstrates the single-stage flyback and PFC controller ICL8001G in an LED Bulb application. Its quasiresonant operation mode, primary side control, integrated PFC and phase-cut dimming control makes it the best in class system solution for dimmable LED bulbs.

ICL8001G Magnetics at Midcom

Midcom manufacture the flyback transformers suitable for US and eu specs. See photo below.

• LED retrofit of 40/60/100W incandescent bulbs
• US and European input voltage options
• 26V at 350mA output
• Quasi-resonant flyback converter
• Phase-cut dimming
• High power factor

LED Drivers and Lighting Solutions - Infineon Technologies

Some Devices -

BCR40x U - Suitable for long strings of LED's with high voltage drop across the power line.
BCR450 - Drives 0.5W, 1W and 3W LED's with an external transistor.

Also Read -

• Efficient Lighting - Complete Solutions for Driving LEDs and Lamps.
• ICL8001G Design Guidelines

Read More - Infineon ICL8001G at EEM

5 Watt LED driver with Zetex - Diodes

LED Drive Solutions and Power Supply Design ideas. Robust and efficient high-brightness LED drivers. Zetex have LED drivers for boost/buck they are cost effective too,

Zetex range of LED drivers - Diodes Incorporated

Shown below is a design from an Application Note of Zetex. Here ZXSC400 drives a Luxeon V Star LED. The input voltage ranges from 4.2V to 5.4 V with a maximum output current of 700mA at 5V input.

ZXSC400 - LED driver boost converter

Voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Excellent load and line regulation.

1.8V to 8V supply range, regulation of ±1%, 80% efficiency, 4.5µA Quiescent drain.

MIP551 and MIP552 - Panasonic Semiconductors

MIP551 and MIP552 are good devices used in LED-lighting power control. Small size & high efficiency and most important worldwide input voltage (80 VAC to 280 VAC), and has dimmer control too.

ASSP for Power Supply - Intelligent Power Device

Typical LED peak current - MIP551 : 0.5 A and MIP552 : 1.0A; Over temperature protection for IPD (Auto-restart). Constant current control with simple LED drive circuit.

IPD for LED-lighting MIP551/MIP552

MIP551/MIP552 - IPD (Intelligent Power Device) LED Lighting Driver 80 to 280 V - Output Freq is 44 kHz

• MIP551 - 10 W Output Max
• MIP552 - 30 W Output Max

Read More at - IPD for LED-lighting MIP551 - EEM

From - Panasonic Semiconductors

Constant LED Brightness and LDS8711

The LDS8711 is a fixed frequency current mode boost converter with internal rectifier and cycle-by- cycle switch current limit specifically designed to drive a string of up to 10 White LEDs.

Constant LED Brightness and LDS8711

High efficiency boost converter with the input voltage range from 2.7 to 5.5 V . Drives one LED string with 10 LEDs in series up to 32 mA.

• 250 mV current sense voltage
• No external Schottky Required
• 0.7 MHz Switching Frequency
• Efficiency greater than 83%
• PWM LED Brightness Control
• Low Shutdown Current (<1µA)

You just saw a Switching Converter Chip with hardly any external components driving a HB LED chain. HB - High Brightness LED. This IC is from IXYS Power Devices.