The LM3450/50A is a power factor controller (PFC) with separate phase dimming decoder. The PFC regulates the output voltage while maintaining excellent power factor. The phase dimming decoder interprets the phase angle and remaps it to a 500Hz PWM output. This device is ideal for implementing a dimmable off-line LED driver for 10-100W loads.

The phase dimming decoder has several unique features. The input-output mapping is programmable for design flexibility, while a dynamic filter and variable sampling rate provide smooth uniform dimming. A dynamic hold circuit ensures that the phase dimmer angle is decoded properly while minimizing extra power loss.

The LM3450A is identical to the LM3450 with the exception of one circuit operation. The dynamic hold current is sampled in the LM3450 while it continuously operates in the LM3450A. This difference between the two devices defines the suitable applications for each. The following is a general guideline for choosing the correct device:

• Any 120V designs with P_OUT > 15W - LM3450A
• Any 230V designs with P_OUT > 25W - LM3450A
• 120V 2-Stage designs with P_OUT < 15W - LM3450
• 230V 2-Stage designs with P_OUT < 25W - LM3450

• Critical Conduction Mode PFC
• Over-Voltage Protection
• Feedback Short Circuit Protection
• 70:1 PWM Decoded From Phase Dimmer
• Analog Dimming
• Programmable Dimming Range
• Digital Angle and Dimmer Detection
• Dynamic Holding Current
• Smooth Dimming Transitions
• Low Power Operation
• Start-Up Pre-Regulator Bias
• Precision Voltage Reference

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• Input voltage (type)
• AC/DC
• Topology
• Boost, Flyback
• Vin (Min) (V)
• 85
• Vin (Max) (V)
• 20
• Iout (Max) (A)
• 2
• Iq (Typ) (mA)
• 1.6
• Features
• Adjustable Switch Frequency, Enable/Shutdown, Thermal Shutdown
• Operating temperature range (C)
• -40 to 125
• Dimming method
• Forward Phase (Triac), Reverse Phase

LM3450的完整型号有：LM3450AMT/NOPB、LM3450AMTX/NOPB、LM3450MT/NOPB、LM3450MTX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3450AMT/NOPB，工作温度：PropertyValue，封装：TSSOP (PW)-16，包装数量MPQ：92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LM3450AMT/NOPB的批量USD价格：.72（1000+）

LM3450AMTX/NOPB，工作温度：PropertyValue，封装：TSSOP (PW)-16，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：NIPDAU，TI官网LM3450AMTX/NOPB的批量USD价格：.6（1000+）

LM3450MT/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：92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LM3450MT/NOPB的批量USD价格：.72（1000+）

LM3450MTX/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，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：NIPDAU，TI官网LM3450MTX/NOPB的批量USD价格：.6（1000+）

LM3450AEV120V30 — LM3450A 120Vac 30W 2 级可调光 LED 驱动器

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

LM3450AEV230V30 — LM3450A 230Vac 30W 2 级可调光 LED 驱动器

The LM3450A evaluation board is designed to provide an AC to LED solution for a 30W LED load. Specifically, it takes an AC mains input and converts it to a constant current output of 700 mA for a series string of 1 to 13 LEDs (maximum LED stack voltage of 45V). There are two assembly versions (...)

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