Showing posts with label LED-Lighting-IC. Show all posts
Showing posts with label LED-Lighting-IC. Show all posts

Monday, March 12, 2012

Offline Isolated Flyback LED Controller - LT3799-1

This chip for LED driving has a power factor correction, the critical conduction mode keeps transformer small. A opto-coupler for feedback is avoided by an innovative primary shunt monitor.

Offline Isolated Flyback LED Controller - LT3799-1

Features

  • Offline 4W to 100W+ LED Applications
  • High DC VIN LED Applications
  • Gate driver to drive an external high voltage MOSFET.
  • Typical power factors of 0.97.

20 Watt LED Driver using LT799-1

20 Watt LED Driver using LT799-1

Monday, August 8, 2011

LED Drive using TPS61042

This Chip from TI is simple to integrate into your designs and this solution is good for production of lighting gadgets, here a consistent quality and predictable performance is easily obtained.
TPS61042 30-V, 500-mA Switch Boost Converter in QFN-8 for White LED Applications
LED-driver application that drives four LEDs with 20 mA of forward current and operates from an input voltage range of 1.8 to 6.0 V.
The entire circuit consists of the control IC, two small ceramic caps, an inductor, a diode, and a current sense resistor. The primary power-supply functions and the secondary features such as load disconnect, overvoltage protection, and PWM dimming have been implemented with a control IC and five small surface-mount passive components. Read more - LED Drive TPS61042 at eem
LED-driver considerations - By Michael Day

Saturday, June 18, 2011

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

Friday, June 17, 2011

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"

MAX1561 - 26V Step-Up Converters - Maxim IC

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.