In the LED lighting design, driver program in general has two kinds: linear drive and switch driver.

 

Linear drive applications is one of the most simple and most direct drive applications. In the lighting level for white LED applications, although there is a low efficiency, adjusting problem of the poor, but because of its simple circuit, small size, Viribright LED globe lamp dab8d29ck can meet the general requirements, therefore in some specific occasions more applications.

 

While the switch type drive can obtain good control precision and high overall efficiency, application mode is mainly divided into buck and boost type two categories. The step-down is driven in response to the supply voltage higher than LED voltage or multiple LED using parallel drive applications. Booster type switch is driven in response to the supply voltage is lower than LED voltage or a plurality of LED series driver applications.

 

On the use of isolated or non-isolated drive scheme, generally, isolated driver safety but low efficiency, non isolated driver efficiency is higher, should according to the actual use requirements to choose isolation / non-isolated driving scheme.

 

The circuit structure : current isolation scheme is AC/DC flyback ( Flyback ) circuit scheme, so the relative circuit is complex, high cost. Non isolated basic is the use of DC/DC step-up or step-down ( Boost ) ( Buck ) circuit, then the relative circuit is simple, the cost is relatively low. Isolation type constant current accuracy can be less than ± 5%, rather than isolation is very difficult to do so.

 

In the field of application: in the electric input power LED lamps ( especially one of the lamps and light source drive ), based on the principle of safety first, the basic no longer employs non-isolating type scheme. But the LED fluorescent lamp of exceptions, Viribright LED Bulb Brand due to the structure and space constraints, still using non isolation scheme. In the low voltage power supply of LED lamps, the principle of giving priority to efficiency and cost, non isolation scheme is the best choice.

 

To provide illumination drive IC semiconductor manufacturers including semiconductors, A Morimi, the United States National Semiconductor, TI, ram ... ... Such as NXP's SSL210x series electric dimming LED illumination driving scheme has the advantages of quick starting, deep dimming and long-life characteristics, the market performance of a very good. A Morimi lighting solutions to meet the different range of power and power supply ( AC/DC, DC/DC ) needs. The United States National Semiconductor 's Powerwise solution is the "high brightness, low power " characteristics, are widely used in indoor, outdoor lighting systems and automotive lighting system with multiple application domains. TI provides LED general illumination power management solutions, hk-car products include series LED driver for AC front end conversion, all kinds of LED lighting drive controller, DC-DC controller, DC-DC LED constant current conversion SWIFT series Synchronous Buck DC/DC converter. ROHM in ultra-small LED technology leader, not only has the PICO series of LED product line, in more recent years to adjustable light LED driving scheme in rapid progress.