LM3445 - Triac 可调光离线式 LED 驱动器

LM3445是TI德州仪器公司的一款LED照明-照明产品，LM3445是Triac 可调光离线式 LED 驱动器，本站介绍了LM3445的封装应用图解、特点和优点、功能等，并给出了与LM3445相关的TI元器件型号供参考。

LM3445 - Triac 可调光离线式 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品特性

TRIAC Dim Decoder Circuit for LED Dimming
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 120-Hz Flicker
Low Profile 10-Pin VSSOP Package or 14-Pin SOIC
Patented Drive Architecture

产品应用

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

产品说明

The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. 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 under-voltage lockout.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM3445	VSSOP (10)	3.00 mm × 3.00 mm
LM3445	SOIC (14)	3.91 mm × 8.65 mm

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