LM3450 - 具有有源功率因数校正和相位明暗调节解码器的 LED 驱动器

LM3450是TI德州仪器公司的一款LED照明-照明产品，LM3450是具有有源功率因数校正和相位明暗调节解码器的 LED 驱动器，本站介绍了LM3450的封装应用图解、特点和优点、功能等，并给出了与LM3450相关的TI元器件型号供参考。

LM3450 - 具有有源功率因数校正和相位明暗调节解码器的 LED 驱动器 - LED照明-照明 - LED驱动器 - 德州仪器

产品描述

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

产品特性

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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