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[原创] Linear LT3964双路同步降压LED驱动器解决方案

关键词:电源管理 DC/DC转换器 LED驱动器 LT3964

时间:2018-02-27 10:45:36       作者:Linear        来源:中电网

Linear公司的LT396是具有I2C接口的双路同步降压DC疍C转换器,工作在恒流和恒压源模式,非常适合于LED驱动器.工作电压4V-36V,恒流稳流±3%,1000:1外接真彩色PWM调光,10:1外接模拟调光,可调开关频率200kHz-2MHz,主要用在通用,工业,医疗和汽车照明,恒流和恒压源.本文介绍了LT3964主要特性,框图和多种应用电路,以及演示板DC2424A主要特性,电路图和材料清单.

The LTR3964 is a dual synchronous step-down DC/DCconverter with I2C interface designed to operate as aconstant-current and constant-voltage source and is idealfor driving LEDs. The fixed frequency and peak currentmode topology result in stable operation over a wide rangeof supply and output voltages. The ground referred voltage FB pin serves as the input for several LED protectionfeatures, and also allows the converter to operate as aconstant-voltage source. The maximum output current isset by an external resistor, and the output current amplifierhas a rail-to-rail common mode range. LT3964 usesan I2C interface to communicate with a microcontrollerto read LED faults, write PWM and analog dimming registersand set fault masking. The I2C PWM input providesLED dimming ratios up to 8192:1. The I2C programmableCTRL register sets the gain of the external CTRL pin, andmaximum current sense threshold, providing additional analog dimming capability.

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