LM3450 LED Driver

National Semiconductor’s PowerWise® LED driver with active power
factor correction and phase dimming decoder

National Semiconductor - LM3450 LED Driver National's LM3450 is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates an accurate output voltage while maintaining excellent power factor at the input. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This combination of features is ideal for implementing a dimmable off-line LED driver for 10W-100W loads. The phase dimming decoder has several unique features. A programmable mapping from input to output increases design flexibility, while a dynamic filter and variable sampling rate provide a fast, smooth response to dimmer movement.

   Features    Applications
  • Critical conduction mode PFC
  • Over-voltage protection
  • Feedback short circuit protection
  • 70:1 PWM decoded from phase dimmer
  • Analog dimming
  • Programmable dimming range
  • Digital angle and dimmer detection
  • Dynamic holding current
  • Smooth dimming transitions
  • Low power operation
  • Start-up pre-regulator bias
  • Precision voltage reference
  • Dimmable downlights
  • Dimmable troffers
  • Dimmable lowbays
  • Indoor area SSL
  • Outdoor area SSL
  • Power supply PFC

Digi-Key Part Number National Part Number PWM Output Package  
LM3450MT/NOPB-ND LM3450MT/NOPB 500Hz TSSOP-16 LM3450 Datasheet