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Optoelectronics/Displays  

PWM controllers simplify HB LED design

Posted: 01 Jun 2009     Print Version  Bookmark and Share

Keywords:HB LED  PWM controller  power MOSFET 

FAN100, FSEZ1016A PWM controllers

Fairchild Semiconductor has introduced primary side regulation (PSR) pulse-width modulation (PWM) controllers that simplify design, reduce board space and deliver important performance advantages for high-brightness (HB) LEDs.

The FSEZ1016A is an EZSWITCH that integrates a PSR PWM controller with a power MOSFET and the FAN100 is a PSR PWM controller. Through this integration, these controllers achieve the most accurate constant current through their built-in proprietary TRUECURRENT technology and tight constant voltage without using secondary-side feedback circuitry.

By tightening the constant current over a wide voltage range, the same circuit can accommodate different numbers of LED units in a string, increasing design flexibility, accelerating time-to-market and stretching the lifetime of HB LEDs. With this high level of integration, these PSR PWM controllers conserve board space, accommodating the form factor of lamp cases that continue to diminish in size.

The FSEZ1016A and FAN100 feature a proprietary green-mode function that provides off-time modulation to linearly decrease the PWM frequency under light-load conditions. They also minimise power consumption (standby power at no load condition <0.15W) by reducing the secondary-side feedback circuitry and components. All of these power-saving features are integral in enabling power supplies to meet stringent energy efficiency specifications. In addition, these PSR PWM controllers offer robust protection features such as under-voltage lockout, over-voltage protection and over-temperature protection.

These products maximise energy savings in power-sensitive applications such as power adapters, power supplies, lighting applications, computers, industrial controls and home appliances.

Samples of the FAN100, FSEZ1016A�are available for Rs.14.17 ($0.28) and Rs.17.72 ($0.35), respectively. Delivery is 12 weeks ARO.

Get related application notes and technical articles on Embedded Design India.





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