TI（NS） LM3448 TRIAC调光离线LED驱动解决方案
TI（NS）公司的LM3448 是集成了600V的MOSFET的TRIAC相位调光的离线LED驱动器，应用电压范围从85VAC到265VAC，可调整的开关频率，不会出现120Hz的闪烁，能为大功率LED提供恒流，主要用于改进型TRIAC调光，固态照明，工业和商业照明以及住宅照明。本文介绍了LM3448主要特性，简化方框图，基本的TRIAC调光电路，典型LED驱动器应用电路以及多种设计案例和指标及其所用材料清单，LM3448 A19 Edison改进型评估板电路图和材料清单。
LM3448：Phase Dimmable Offline LED Driver with Integrated FET
The LM3448 is an adaptive constant off-time AC/DC buck (step-down) constant current LED regulator designed to be compatible with TRIAC dimmers. The LM3448 provides a constant current for illuminating high power LEDs and includes a phase angle dim decoder. The dim decoder allows wide range LED dimming using standard forward and reverse phase TRIAC dimmers. The integrated high-voltage and low Rdson MOSFET reduces design complexity while improving LED drive`rm factor LED drivers suitable for integrated LED lamps with very low external component count. The LM3448 also provides the flexibility required to implement both isolated and non-isolated solutions based on the Flyback, Buck or Buck-Boost topology using either active or passive power factor correction (Valley- Fill) circuits. Additional features include thermal shutdown, current limit and VCC under-voltage lockout...
