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 driver efficiency. The integrated and patented architecture facilitates implementation of small form 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.

Device Uses

• Retrofit TRIAC Dimming
• Solid State Lighting
• Industrial and Commercial Lighting
• Residential Lighting

LM3448-230VAC, 6W Isolated Flyback LED Driver Eval Board
This demonstration board highlights the performance of a LM3448 based Flyback LED driver solution that can be used to power a single LED string consisting of seven to eleven series connected LEDs from a 180 VRMS to 265 VRMS, 50 Hz input power supply.

LM3448 -120VAC, 6W Isolated Flyback LED Driver Eval Board
This demonstration board highlights the performance of a LM3448 based Flyback LED driver solution that can be used to power a single LED string consisting of seven to eleven series connected LEDs from a 85 VRMS to 135 VRMS, 60 Hz input power supply.