深圳市德江电子有限公司

    型 号：LM3445MM/NOPB
  厂 家：TI/NS
  封 装：MSOP10

  批 号：1536
  数 量：7200

  包装：1000 Units ,Tape and Reel
  

  说 明：

  德江电子代理分销 TI/NS 的 LM34 系列 IC , LM3445MM 是我司常备库存现货的物料。

   Triac Dimmable Offline LED Driver 

    General Description 

    The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current 

controller designed to be compatible with triac dimmers. The LM3445 provides a constant 

current for illuminating high power LEDs and includes a triac dim decoder. The dim decoder 

allows wide range LED dimming using standard triac dimmers. The high frequency capable 

architecture allows the use of small external passive components. The LM3445 includes a 

bleeder circuit to ensure proper triac operation by allowing current flow while the line voltage

is low to enable proper firing of the triac. A passive PFC circuit ensures good power factor by

drawing current directly from the line for most of the cycle, and provides a constant positive 

voltage to the buck regulator. Additional features include thermal shutdown, current limit and

VCC under-voltage lockout. 

    Features

   1）Triac dim decoder circuit for LED dimming 

   2）Application voltage range 80VAC – 277VAC

   3）Capable of controlling LED currents greater than 1A

   4）Adjustable switching frequency

   5）Low quiescent current

   6）Adaptive programmable off-time allows for constant ripple current

   7）Thermal shutdown

   8）No 120Hz flicker

   9）Low profile 10 pin MSOP Package or 14 pin SOIC 

 10）Patent pending drive architecture 

    Applications

   1） Retro Fit Triac Dimming 

   2） Solid State Lighting 

   3） Industrial and Commercial Lighting 

   4） Residential Lighting