LM3444中文资料交流/直流离线式 LED 驱动器数据手册TI规格书

描述 Description

The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. A passive PFC circuit ensures good power factor by drawing current directly 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 VCC undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.

特性 Features

• Application Voltage Range: 80 VAC to 277 VAC
• Capable of Controlling LED Currents Greater than 1 A
• Adjustable Switching Frequency
• Low Quiescent Current
• Adaptive Programmable Off-Time Allows for Constant Ripple Current
• Thermal Shutdown
• No Flicker at 120 Hz
• Low-Profile 10-Pin VSSOP Package or 8-Lead SOIC Package
• Patented Drive Architecture