NXP UBA3077HN高效LED驱动解决方案

NXP公司的UBA3077HN是高效LED驱动器,工作电压从10V到42V,5V可用于低压电路,能驱动每串20个的3串LED,每串电流高达150mA,电流精度±2 %,三个升压转换器的输出可高达75V,恒定500kHz频率峰值电流模式控制,主要用于通用LED照明和背景光LCD显示器.本文介绍了UBA3077HN主要特性, 方框图以及典型应用框图和相应元件值.

The UBA3077HN is a high efficiency LED driver in an HVQFN40 package for general LED lighting or backlighting LCD displays.

Operating from a supply of 10 V to 42 V, it can drive up to 3 strings of 20 LEDs each. The low voltage circuitry is powered by an external 5 V voltage supply.

The chip can operate autonomously or be controlled via a 400 kHz I2C-bus. The peak current in each string is fixed by an external resistor. Three independent Pulse-Width Modulated (PWM) signals are available for dimming purposes. These PWM signals are delivered either directly by the graphic processor (direct control mode) to the pins PWM1, PWM2 and PWM3, or generated on-board based on data sent via the I2C-bus interface. Each LED string is supplied by its own boost converter delivering an output voltage from VIN up to 75 V. The switching frequency is 500 kHz.
..

查看全文