The LM3450 is a power factor controller (PFC) with a separate phase dimming decoder. It is ideal for implementing a dimmable off-line LED driver for 10-100 W loads. The phase dimming decoder interprets the phase angle and remaps it to a 500 Hz PWM output.

LinkSwitch-PH dramatically simplifies implementation of LED drivers requiring Power Factors greater than 0.9, TRIAC dimming, and high efficiency. This controller introduces a new control technique that provides a very high power factor and eliminates passive circuitry required for power factor correction, optocoupler and secondary current control circuitry.

•   Universal AC input 90-264V         
•   350mA to 1050mA output
•   56V max output voltage
•   83% efficiency at full load
•   Active PFC > 0.95
•   UL-8750 and 3 kVAC isolation
•   5 year warranty

• Input voltage: 120 or 230 VAC
• Output current: 350 - 1500 mA
• Output voltage: 5 - 48 V 
• Active power factor correction
• Operates with standard dimmers
• Long life > 50,000 hours

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The LM3450 evaluation board is designed to provide an AC to LED solution for a 15 W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 350 mA for a series string of 1 to 14 LEDs (maximum LED stack voltage of 45V). The board employs a two stage design with an LM3450 flyback primary stage and an LM3409 secondary stage.