NS LM3429高压75V LED驱动调光解决方案

NS 公司的LM3429是多用途高压 LED驱动器控制器,可以配置成降压,升压,升/降压(Flyback)或SEPIC拓扑,输入和输出的工作电压额定值为75V,内部的PWM控制器可调开关频率高达2MHz.同时还集成了精密的基准电压,用于快速PWM调光的逻辑兼容DIM输入,逐个周期的限流和热关断.本文介绍了LM3429的主要特性, 典型应用电路以及LM2841/2 PWM DC/DC降压稳压器的主要特性,方框图和几种典型应用.同时还介绍了采用LM3429和LM2841/2的升/降压Nuventix参考设计电路图和评估板材料清单(BOM).
The LM3429 is a versatile high voltage LED driver controller.
With the capability to be configured in a Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and an input and output operating voltage rating of 75V, the LM3429 is ideal for illuminating LEDs in a very diverse, large family of applications.
Adjustable high-side current sense with a typical sense voltage of 100 mV allows for tight regulation of the LED current with the highest efficiency possible. Output LED current regulation is based on peak current-mode control with predictive Off-Time Control. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.
The LM3429 includes a high-voltage startup regulator that operates over a wide input range of 4.5V to 75V. The internal PWM controller is designed for adjustable switching frequencies of up to 2.0MHz, thus enabling compact solutions. Additional features include: precision reference, logic compatible DIM input suitable for fast PWM dimming,cycle-by-cycle current limit, and thermal shutdown.
The LM3429 comes in a low profile, thermally efficient TSSOP EP 14-lead package.
LM3429主要特性:
■ VIN range from 4.5V to 75V
■ 2% Internal reference voltage (1.235V)
■ Current sense voltage adjustable from 20 mV
■ High-side current sensing
■ 2Ω MOSFET gate driver
■ Dimming MOSFET gate driver
■ Input under-voltage protection
■ Over-voltage protection
■ Low shutdown current, IQ < 1μA
■ Fast (50kHz) PWM dimming
■ ...