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Diodes公司的智能照明LED驱动器确保无闪烁调光

关键词:Diodes智能照明LED驱动器 无闪烁调光 PWM调光控制

时间:2015-09-10 13:29:53      来源:中电网

国际即时新品(原文:英文)

Smart-Lighting LED Drivers from Diodes Incorporated Ensure Flicker-Free Dimming of Tunable White and Color LED Bulbs

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 AL1791/2/3/4 LED drivers. These single-, dual-, triple-, and quad-channel DC-to-constant current (DC-CC) LED driver ICs provide both analog and PWM dimming control and are targeted for smart, connected-lighting applications that use tunable white and color LED bulbs. When combined with an AC-DC power conversion block and a microcontroller, these current-ratio-optimized regulators provide a cost-effective, scalable and easy-to-implement solution for the emerging smart lighting market.

Operating from a 6.5V to 30V input voltage range, the AL1791/2/3/4 constant-current regulators can drive up to four independent LED channels with a maximum of 500mA per channel or 1.5A total drive current for the AL1792/3/4, or 1A maximum for the AL1791. Each channel can be individually controlled down to 0.125% with 500Hz to 10kHz flicker-free PWM dimming or with analog dimming down to 1.25%. Using the same pin for both inputs ensures the appropriate analog or PWM dimming response.

Support for deep dimming (to below 1%) is important because the human eye perceives light strength as the square root of the measured light, which is proportional to the dimming current. Similarly, while the human eye only notices flicker below 120Hz, the ability to operate PWM dimming above 1kHz avoids problems with e-Flicker, which is the flicker picked up by cameras such as those found in smart phones that can result in dark bands on still images. The AL179X is capable of high frequency PWM for deep dimming applications: 10kHz at 1.0%, 4kHz at 0.4% and 1kHz at 0.1%.

The AL179x LED drivers all feature an enable pin or low standby power, internal protection for LED string open/short-circuit and under voltage lockout, over-temperature protection with thermal shutdown and auto-recovery, and full fault reporting as well as LED power-good reporting. An integrated low-side current sink topology allows for either lower cost common-anode LED connections or different anode voltages for improved energy-efficiency. All devices operate over an ambient temperature range of -40oC to +125oC and are packaged in the same 14-pin UDFN-4030 package, which allows for easy scalability of LED driver design in smart, connected-lighting applications.









中文自动翻译,供参考

Diodes公司的智能照明LED驱动器确保无闪烁调光

Diodes公司(纳斯达克股票代码:DIOD),为广泛的分立,逻辑及模拟半导体市场的全球领先制造商和高品质的应用专用标准产品和供应商,今天宣布推出AL1791 / 2/3/4的LED驱动器。这些单,双,三重和四通道的DC-恒定电流(DC-CC)LED驱动器IC提供模拟和PWM调光控制,并针对使用智能,连接性照明应用可调白彩色LED灯泡。当使用的AC-DC功率转换块和一个微控制器结合起来,这些电流比优化的调节器提供一种成本效益的,可扩展性和易于实施为新兴的智能照明市场溶液。

从6.5V工作至30V的输入电压范围,AL1791 / 2/3/4恒流稳压器可驱动多达四个独立的LED通道,最高每通道或1.5A总驱动电流500mA的电流为AL1792 / 3 / 4,或1A最大的AL1791。每个通道都可以单独控制下降到0.125%,与500Hz的10kHz的频率无闪烁PWM调光或模拟调光下降到1.25%。使用相同的引脚为输入,确保适当的模拟或PWM调光响应。

支持深调光(1%以下)是重要的,因为人眼感知的光强度的平方根所测量的光,这是正比于调光的电流。同样的,而人眼只能通知闪烁低于120Hz的,操作在1kHz以上的PWM调光的能力,避免问题的​​e-闪烁,这是拾起相机,如在智能手机中,可能导致暗带的还是忽悠图像。该AL179X能够高频率PWM深调光应用:10kHz的1.0%,4kHz的0.4%和1kHz的0.1%。

该AL179x LED驱动器都配备了一个使能引脚,低待机功耗,为LED串开路/短路和欠压锁定内部保护,过温保护,热关断和自动恢复,完全故障报告,以及LED电源 - 良好的报告。集成的低侧电流吸收器拓扑允许用户选择成本更低的共阳极LED连接或不同的阳极电压,提高能源效率。所有器件工作在-40℃至+ 125℃的环境温度范围和封装在同一个14引脚UDFN-4030封装,从而方便的可扩展性的LED驱动器设计的智能,连接性照明应用。

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