ST HVLED805离线反激LED驱动解决方案

ST公司的HVLED805是具有初级检测的离线LED驱动器,包括了高性能低压PWM控制器和800V耐雪崩击穿的功率MOSFET,可直接连接到火线整流电压,恒流LED输出电流精度5%,不需要光耦器件,准谐振(QR)零电压开关(ZVS)工作,内部HV起动电路,能对LED串的开路或短路进行管理,主要用在AC/DC LED驱动器,LED替代灯(如E27, GU10)等.本文介绍了HVLED80主要特性, 应用框图以及多种性能测试电路.

HVLED805: Off-line LED driver with primary-sensing

The HVLED805 is a high-voltage primary switcher intended for operating directly from the rectified mains with minimum external parts to provide an efficient, compact and cost effective solution for LED driving. It combines a high-performance low-voltage PWM controller chip and an 800V, avalanche-rugged power MOSFET, in the same package.

The PWM is a current-mode controller IC specifically designed for ZVS (zero voltage switching) fly-back LED drivers, with constant output current (CC) regulation using primarysensing feedback. This eliminates the need for the opto-coupler, the secondary voltage reference, as well as the current sense on the secondary side, still maintaining a good LED current accuracy. Moreover it guarantees a safe operation when short circuit of one or more LEDs occurs.
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