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LM3445 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM3445
Descripción Electrónicos  Triac Dimmable Offline LED Driver
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3445 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM3445
September 22, 2010
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 com-
patible 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 dim-
ming using standard triac dimmers. The high frequency ca-
pable 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 di-
rectly 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 V
CC un-
der-voltage lockout.
Features
Triac dim decoder circuit for LED dimming
Application voltage range 80V
AC – 277VAC
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 or 14 pin SOIC
Patent pending drive architecture
Applications
Retro Fit Triac Dimming
Solid State Lighting
Industrial and Commercial Lighting
Residential Lighting
Typical LM3445 LED Driver Application Circuit
30060301
30060305
© 2010 National Semiconductor Corporation
300603
www.national.com


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