ST EVALHVLED805 4.2W离线LED驱动解决方案
ST 公司的EVALHVLED805是HVLED805 PWM电流模式LED驱动器的演示板,是 4.2W离线LED驱动器.输入电压VIN从185到265 VAC,火线频率50-60Hz,最大输出功率4.2W,最大电压12V,输出电流350 mA ± 5%,正常模式的开关闭频率大于70kHz,平均效率大于70%,无负载的最大输入功率小于100W.本文介绍了EVALHVLED805主要特性, 电路图和材料清单(BOM).
4.2 W off-line LED driver with primary side regulation
The EVALHVLED805 is a demonstration board equipped with the new HVLED805 PWM current mode LED driver and is designed for European mains. It can control, with very good accuracy, from 1 to 3 LEDs having a nominal current of 350 mA. The HVLED805 has integrated high voltage startup and an 800 V power MOSFET. The high MOSFET’s breakdown voltage allows very robust and reliable applications and reduces the size of the snubber and the relative power dissipation. Its accurate primary-current control eliminates the need of the optocoupler which impacts the cost, the compactness and the lifetime of the application while still maintaining a very good LED accuracy (below 5 %). Moreover, this converter, specifically designed for quasiresonant (QR) flyback converters, enables very low turn-on losses and EMI emissions.图1.EVALHVLED805外形图
EVALHVLED805主要特性:
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