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Diodes公司的可调电流调节器简化LED驱动

关键词:Diodes 可调电流调节器简化LED驱动 BCR420U BCR421U

时间:2015-12-09 14:07:00      来源:中电网

国际即时新品(原文:英文)

Adjustable Current Regulators from Diodes Incorporated Simplify the Driving of LED Strips

PLANO, Texas--(BUSINESS WIRE)--Diodes Incorporated (Nasdaq: DIOD), a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets, today introduced the BCR420U and BCR421U. These constant-current regulators (CCR) provide a simple means of driving low-power linear LED strips. Target applications are those that benefit from the improved efficiency, flexibility and longer life offered by LEDs as an emerging lighting source. These include LED strips for mood lighting, emergency and advertising signage, and decorative lighting for retail refrigeration and vending machines.

The BCR420U and BCR421U allow an optimized LED current to be set giving a uniform brightness and extend the LED longevity. Supporting adjustable currents from 10mA to 350mA allows for platform designs based on a single device to be used across multiple LED string applications, considerably easing a manufacturer’s overall qualification process. These LED drivers also enhance system reliability as the monolithic integration of a transistor, diodes and resistors both simplifies system design and reduces component count.

A negative temperature coefficient, which reduces the output current as the temperature increases, allows current sharing between two or more of these CCR devices. This enables them to be connected in parallel to create a higher current output without risk of thermal runaway. The 40V maximum input rating provides sufficient headroom for transient supply voltages and allows for LED short failures on long strings. With its low-side driver configuration, the BCR421U has the added feature of an enable function that can adjust the light output level using a PWM input signal. Both devices are supplied in SOT26 packages, providing pin-compatibility with other sources.









中文自动翻译,供参考

Diodes公司的可调电流调节器简化LED驱动

Diodes公司(纳斯达克股票代码:DIOD),全球领先的制造商和高品质的特定应用标准产品供应商的广泛的分立,逻辑及模拟半导体市场,今天推出了BCR420U和BCR421U 。这些恒流稳压器(CCR)提供驱动低功耗线性的简单方法灯条。目标应用是那些受益于改进的效率,灵活性和更长的寿命通过发光二极管提供作为一种新兴的照明光源。这些措施包括LED灯条的情调照明,应急和广告标牌和灯饰零售制冷和自动售货机。

所述BCR420U和BCR421U允许优化的LED电流被设定给一个均匀的亮度和延长LED的寿命。支持可调电流在10mA至350mA允许基于一台设备上的平台设计,可以使用多个LED串的应用,大大缓解了制造商的整个鉴定过程。这些LED驱动器还增强了系统可靠性的晶体管,二极管和电阻器的单片集成既简化了系统设计,减少了元件数量。

负温度系数,从而降低了输出电流随着温度的升高,允许两个或更多这些CCR装置之间的电流分配。这使他们能够被并联连接以创建一个更高的电流输出,而不热失控的危险性。在40V最大额定输入提供了足够的扩展空间瞬变电源电压和允许在长串LED短路故障。凭借其低侧驱动器配置中,BCR421U有一个使能功能,可以调整使用PWM输入信号的光输出电平的增加的特征。两款器件均提供在SOT2​​6封装,提供与其他来源的引脚兼容性。

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