LM3445 TRIAC調(diào)光LED驅(qū)動(dòng)參考設(shè)計(jì)
LM3445是 TRIAC調(diào)光兼容的自適應(yīng)離線AC/DC降壓恒流控制器,具有LED調(diào)光用
的TRIAC調(diào)光譯碼電路,輸入電壓從80VAC到270VAC,控制LED電流大于1A,可調(diào)整開(kāi)關(guān)頻率.
它的無(wú)源PFC電路使得電路有更好的效率. LM3445主要用在后配合的TRIAC調(diào)光,固態(tài)照明,
工業(yè)和商業(yè)照明以及住宅區(qū)照明.本文介紹了LM3445的主要特性, 簡(jiǎn)化方框圖, 典型應(yīng)用
電路, 主從配置框圖以及帶Valley-Fill 電路的主/從配置框圖, LM3445設(shè)計(jì)案例電路圖
和材料清單, LM3445評(píng)估板電路圖和材料清單.此外還介紹了LM3445離線TRIAC調(diào)光LED驅(qū)
動(dòng)器參考設(shè)計(jì)(120V和230V)與材料清單.
LM3445主要特性:
■Triac dim decoder circuit for LED dimming
■Application voltage range 80VAC – 270VAC
■Capable of controlling LED currents greater than 1A
■Adjustable switching frequency
■Low quiescent current
■Adaptive programmable off-time allows for constant ripple current
■Thermal shutdown
■No 120Hz flicker
■Low profile 10 pin MSOP Package
■Patent pending drive architecture
LM3445應(yīng)用:
■Retro Fit Triac Dimming
■Solid State Lighting
■Industrial and Commercial Lighting
■Residential Lighting
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