- 制造厂商:TI
- 产品类别:电源管理
- 技术类目:LED 驱动器 - 照明 LED 驱动器
- 功能描述:双向晶闸管可调光离线式 LED 驱动器
- 点击这里打开及下载LM3445的技术文档资料
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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.
- 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
- Input voltage (type)
- AC/DC
- Topology
- Buck, Flyback
- Vin (Min) (V)
- 8
- Vin (Max) (V)
- 12
- Iout (Max) (A)
- 2
- Iq (Typ) (mA)
- 2
- Features
- Adjustable Switch Frequency, Enable/Shutdown, Thermal Shutdown
- Operating temperature range (C)
- -40 to 125
- Dimming method
- Forward Phase (Triac), PWM, Reverse Phase
LM3445的完整型号有:LM3445M/NOPB、LM3445MM/NOPB、LM3445MMX/NOPB、LM3445MX/NOPB,以下是这些产品的关键参数及官网采购报价:
LM3445M/NOPB,工作温度:PropertyValue,封装:SOIC (D)-14,包装数量MPQ:55个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3445M/NOPB的批量USD价格:.36(1000+)
LM3445MM/NOPB,工作温度:-40 to 125,封装:VSSOP (DGS)-10,包装数量MPQ:1000个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:NIPDAUAG,TI官网LM3445MM/NOPB的批量USD价格:.36(1000+)
LM3445MMX/NOPB,工作温度:-40 to 125,封装:VSSOP (DGS)-10,包装数量MPQ:3500个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:NIPDAUAG,TI官网LM3445MMX/NOPB的批量USD价格:.3(1000+)
LM3445MX/NOPB,工作温度:PropertyValue,封装:SOIC (D)-14,包装数量MPQ:2500个,MSL 等级/回流焊峰值温度:Level-1-260C-UNLIM,引脚镀层/焊球材料:SN,TI官网LM3445MX/NOPB的批量USD价格:.3(1000+)
LM3445-120VFLBK — 专门针对 120V 输入隔离应用进行优化的 120VFLBK-LM3445 评估板
This demonstration board highlights the performance of a LM3445 based Flyback LED driver solution that can be used to power a single LED string consisting of 4 to 8 series connected LEDs from an 90 VRMS to 135 VRMS, 60 Hz input power supply. The key performance characteristics under typical (...)
LM3445-EDSNEV — EDSNEV- 专门针对小型解决方案进行优化的 10W、非隔离 LM3445 评估板
The evaluation board included in this shipment converts 85VAC to 135VAC input and drives five to thirteen series connected LED`s at the currents listed in the Evaluation Board Operating Conditions section. This is a two-layer board using the bottom and top layer for component placement. The board (...)
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。
PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice
PSpice for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence 的模拟分析引擎。PSpice for TI 可免费使用,包括业内超大的模型库之一,涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。借助?PSpice for TI 的设计和仿真环境及其内置的模型库,您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案,然后再进行布局和制造,可缩短产品上市时间并降低开发成本。
在?PSpice for TI 设计和仿真工具中,您可以搜索 TI (...)
PMP30439 — 在电流为 200mA 时具有 230V 输入和 180V 输出的恒流 LED 驱动器参考设计
此参考设计是一款低侧降压设计(输出电压以正直流输入(+Vin 节点)为基准,而非 GND 节点)。控制器驱动 LED 灯串,电压高达 180V,电流为 200mA 恒流。低侧降压拓扑可直接驱动 FET,无需高侧驱动器,因此简化了原理图。