LT3754

• Product Introduction

LT3754

16-channel x 50mA LED driver

peculiarity

• 高达 45V 的 LED x 50mA、16 通道 LED drive
• 宽输入范围：6V 至 40V
• 在 20mA 电流条件下实现 ±2.8% LED 电流匹配准确度 (典型值为 ±0.7%)
• 高达 3000 : 1 的 True Color PWM^TM 调光范围
• 可利用单个电阻器来设定 LED 电流 (10mA 至 50mA)
• 即使在 PV_IN > V_OUT 的情况下仍然保持对 LED 电流的调节作用
• 输出适合于 LED V_F 以实现最佳效率
• 提供针对开路 LED 串的故障标记和保护作用
• 针对 V_OUT 短路的 LED 引脚保护
• 可通过通道的并联来提供较高的 LED 电流
• 可编程 LED 电流降额与温度的关系
• 具可编程迟滞的准确欠压闭锁门限
• 可编程频率 (100kHz 至 1MHz)
• 可同步至一个外部时钟

description

®The LT 3754 is a 16-channel LED driver with a step-up DC/DC controller capable of driving LEDs up to 45V. Each channel contains an accurate current absorber with ±2.8% LED current matching accuracy. Each channel follows a master programmable current to deliver 10mA to 50mA LED current per string of LEDs. Higher LED currents can be provided by paralleling channels. The output voltage is adapted to the variation in the LED VF for optimal efficiency, and the open LED fault does not affect the operation of the connected LED string.

The LT3754 offers a PWM dimming range of up to 3000:1 and an analog dimming range of up to 25:1. Its operating frequency can be set using a single resistor (from 100kHz up to 1MHz) or synchronized to an external clock.

Other features of the device include a programmable maximum VOUT to provide open LED protection, a fault mark to indicate the open LED circuit, programmable LED current derating in relation to temperature, micropower shutdown mode, and an internal soft-start function. The LT3754 is available in a thermally enhanced 5mm x 5mm 32-pin QFN package.

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