LM3445
- 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
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.
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设计和开发
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LM3445EVM-695 — LM3445 120Vac 填谷式降压双向晶闸管可调光 LED 驱动器评估模块
LM3445EVM-695 使用德州仪器 (TI) 的 LM3445 集成电路实现调光解决方案。LM3445 是一种内置有相位调光解码器的自适应恒定关闭时间交流/直流降压恒定电流控制器。线路周期由内部低功耗数字控制器持续分析其形状和对称性。随后生成模拟电流基准,并由电源转换器级用于调节输出电流。模拟基准经由专为优化调光器兼容性、功率因数和 THD 而开发的控制算法进行控制。通过使用恒定关闭时间控制,该解决方案实现了低部件数量、高效率并固有地提供开关频率变化。此变化产生了一种仿真展频效应,从而可简化转换器 EMI 特征并接受更小的输入滤波器。
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封装 | 引脚 | CAD 符号、封装和 3D 模型 |
---|---|---|
SOIC (D) | 14 | Ultra Librarian |
VSSOP (DGS) | 10 | Ultra Librarian |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
- 制造厂地点
- 封装厂地点