DESCRIPTION

· The LM3445 is an adaptive constant off-time AC/DC buck constant current controller designed for TRIAC dimmable LED drivers.
· It provides a constant current for high-power LEDs and includes a TRIAC dim decoder for wide range LED dimming using standard TRIAC dimmers.
· The high-frequency architecture allows the use of small external passive components.
· It includes a bleeder circuit for proper TRIAC operation and a passive PFC circuit for good power factor.
· Additional features include thermal shutdown, current limit, and VCC under-voltage lockout.

FEATURES

· TRIAC Dim Decoder Circuit for LED Dimming
· Application Voltage Range: 80VAC to 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 120-Hz Flicker
· Low Profile 10-Pin VSSOP Package or 14-Pin SOIC
· Patented Drive Architecture

APPLICATIONS

· Retro Fit TRIAC Dimming
· Solid State Lighting
· Industrial and Commercial Lighting
· Residential Lighting