LM3445是TI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，本页介绍了LM3445的产品说明、应用、特性等，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 - TI公司（Texas Instruments，德州仪器）
- 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
- Retro Fit TRIAC Dimming
- Solid State Lighting
- Industrial and Commercial Lighting
- Residential Lighting
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.
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LM3445 | VSSOP (10) | 3.00 mm × 3.00 mm |
| SOIC (14) | 3.91 mm × 8.65 mm |
