IR采用IRS540的IRPLLED1高压LED驱动 方案.docVIP

IR采用IRS2540的IRPLLED1高压LED驱动 方案? 简介 IR公司的IRS254(0,1)是高压(200 V (IRS2540)和600 V (IRS2541))高频降压恒流LED电流调整控制器, 采用连续模式时延滞后降压稳压器,直接控制负载平均电流.起动电流小于500uA,140ns死区,片内基准电压±2%,频率高达500kHz.本文介绍 了IRS254(0,1)的主要特性,方框图以及采用单个和两个MOSFET的IRS2540应用电路.同时还介绍了采用IRS2540的350mA 到1.5A高压LED驱动器IRPLLED1的电路图和所用材料清单.The IRS254(0,1) are high voltage, high frequency buck control ICs for constant LED current regulation. They incorporate a continuous mode time-delayed hysteretic buck regulator to directly control the average load current, using an accurate on-chip bandgap voltage reference.The application is inherently protected against short circuit conditions, with the ability to easily add opencircuit protection. An external high-side bootstrap circuit drives the buck switching element at high frequencies. A low-side driver is also provided for synchronous rectifier designs. All functions are realized within a simple 8 pin DIP or SOIC package.IRS2540主要特性:200 V (IRS2540) and 600 V (IRS2541) half bridge driverMicropower startup (500 μA)±2% voltage reference140 ns deadtime15.6 V zener clamp on VCCFrequency up to 500 kHzAuto restart, non-latched shutdownPWM dimmableSmall 8-Lead DIP/8-Lead SOIC packages图1.IRS2540方框图图2.IRS2540应用电路图3. 采用单个MOSFET的IRS2540应用电路采用 IRS2540的IRPLLED1 350mA 到1.5A高压LED驱动器IRPLLED1 350mA to 1.5A High Voltage LED Driver using IRS2540As the industry becomes more power conscious to compensate for increasing energy costs and to meet governmental regulations, new innovative ways of conserving energy are being developed. For the lighting industry one of these outlets has been LEDs. Due to their longevity, robust design, low maintenance and high efficiency, they have proven a viable alternative to less efficient light sources. With their long term projected falling cost and further increased efficiency, the industry has eagerly embraced LEDs, putting them largely in demand. LEDs require drivers that have specific features such as constant current cont