LT3956

• Product Introduction

LT3956

80Vin, 80Vout constant current, constant voltage converter

peculiarity

• 3000:1 True Color PWM^TM 调光
• 宽输入电压范围：4.5V 至 80V
• 输出电压高达 80V
• 内部 3.3A/84V 开关
• 恒定电流和恒定电压调节
• 250mV 高端电流检测
• 可以采用升压、降压模式、降压-升压模式、SEPIC 或反激式拓扑结构来驱动 LED
• 可调频率：100kHz 至 1MHz
• 开路 LED保护
• 具迟滞的可编程欠压闭锁
• 恒定电压环路状态引脚
• PWM 断接开关驱动器
• CTRL 引脚负责调节高端电流检测门限
• 低停机电流：
• 可编程软起动
• 采用 36 引脚 (5mm x 6mm) QFN 封装

• description

  ®The LT 3956 is a DC/DC converter designed to act as a constant current source and constant voltage regulator. It is ideal for driving high-current LEDs. The device features an internal low-end N-channel power MOSFET that is rated for 84V/3.3A and is driven from an internally tuned 7.15V supply. The fixed-frequency, current-mode architecture enables stable operation over a wide range of supply and output voltages. A ground-referenced voltage FB pin is used as an input for multiple LED protection function circuits, and it also enables the converter to act as a constant voltage source. A frequency adjustment pin allows users to set frequencies in a range of 100kHz to 1MHz, designed to optimize efficiency, performance, or external component size.

  The LT3956 senses the output current at the high end of the LED string. High-end current sensing is the most flexible solution for driving LEDs, allowing for boost, buck, or buck-boost mode configurations. The PWM input provides an LED dimming ratio of up to 3000:1, while the CTRL input provides additional analog dimming capabilities. 

• apply

  • 高功率 LED
  • 电池充电器
  • 准确的电流受限型电压调节器