Under the global trend of energy saving and carbon reduction, LED lighting is highly anticipated, and with the increasing luminous efficiency of high-brightness LEDs in recent years, the unit cost has also declined, prompting high-brightness LED applications to be no longer limited to small and medium-sized electronic products, or It is a large-size backlight application and LED display board for notebook computers, monitors, TVs, etc. At present, it has begun to replace traditional incandescent lamps and other lighting products. LED has undoubtedly become an important source of illumination for the next generation of general illumination.
In view of the market prospects of LED lighting, industry insiders pointed out that in 2012, the global LED lighting output value is expected to grow to 11 billion US dollars, increased to 19.2 billion US dollars in 2015, and the compound growth rate of nearly 4% in four years. Industry insiders analyzed that consumer electronics products are suffering from poor economic performance, and the replacement effect of new display technologies such as AMOLED is gradually expanding, which makes the LED backlight market relying on consumer electronics products to face bottlenecks. In contrast, even if LED lighting grows slowly, the market prospects are established, and it is expected to bring new hope to the LED industry within five years.
In particular, the government's policy to ban incandescent lamps will begin to ferment in 2012, and more than two-thirds of the world's regions have begun to ban incandescent or high-watt incandescent lighting. After the incandescent lamp period has come, the importance of LED in lighting applications has been highlighted, and the next four years will be the final critical period for the LED layout lighting market. In the application market segment, outdoor lighting will be prioritized, commercial lighting, industrial lighting , and automotive lighting will be seconded, and finally penetrated into the home market.
High efficiency, reliability and long life, the driver is the key
In the LED lighting application market, the replacement of the lamp market is the most popular at this stage. The success factors of this market include high efficiency, sufficient working reliability and longevity of the driving power supply. For these conditions, the LED driver plays an extreme role. Important role. In response to this, Pan Dawei, vice president of sales for IR Asia Pacific, pointed out that the solid-state lighting industry is developing rapidly, so the demand for low-cost driver electronic components is increasing day by day, so that high-brightness and high-power LEDs supply constant current output.
To meet these needs, IR has introduced a new high-voltage buck regulator control IC, the IRS2980, for LED bulb replacement, LED tube lighting and other non-isolated LED driver applications. The IRS2980 is the company's first product in the high-voltage LED driver IC family, rated at 600V, and uses hysteresis average current mode control for precise current regulation. The new LED step-down driver includes a low-side MOSFET driver with a high-voltage internal regulator and high-side current sensing. The converter is compatible with electronic pulse width modulation dimming, and the current control covers 0 to 100%.
Pan Dawei further pointed out that the new IRS2980 can improve performance at a lower system cost than other solutions for non-isolated LED driver applications. The IRS2980 in an SO-8 package provides top-level electrical overstress protection and higher field efficiency with an IR advanced high voltage IC process that incorporates the latest high voltage level shifting and termination technology.
Digital power control method solves many problems
Basically, the driver for LED replacement lamp is mostly realized by step-down switching regulator. ROHM pointed out that in order for LEDs to illuminate at a fixed brightness, an LED driver IC that performs constant current control must be installed. In general, a step-down switching regulator is usually used. This is because the traditional method will cause the input voltage/output voltage to change too much, and depending on the application conditions, it is possible to redesign the power module.
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