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添加:1970-01-01 08:00:01 更新:2019-10-18 11:28:21 点击:13
KEY标签: 电流 | 3755 | 驱动 | Linear | LT3755 | 稳压 | 控制器 | LT
Linear公司的LT3755和LT3755-1是大电流DC/DC控制器,可作为恒流源用来驱动大电流 . LT3755和LT3755-1通过内部的7V稳压源来驱动低边N沟功率MOSFET. LT3755和LT3755-1具有3000:1的真彩色PWM调光,输入电压可从4.5V到40V,而输出电压可高达60V,广泛应用在大功率LED驱动,工业和汽车电子领域.本文介绍了LT3755和LT3755-1的主要特性,方框图以及典型应用电路图和50W白光LED头灯驱动电路, 降压模式1.4ALED驱动电路, 20W SEPIC LED驱动电路和汽车电子用降压-升压LED驱动电路. The LT3755 and LT3755-1 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size. The LT3755/LT3755-1 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability. Both parts are available in the 16-lead (3mmX3mm) QFN package. 主要特性: 3000:1 True Color PWMTM Dimming Wide Input Voltage Range: 4.5V to 40V Output Voltage Up to 60V Constant-Current and Constant-Voltage Regulation 100mV High Side Current Sense Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology