Linear LT3760 8路LED驱动方案--打印文章

Linear LT3760 8路LED驱动方案来源于瑞达科技网

作者：佚名文章来源：网络点击数更新时间：2011/1/8 文章录入：瑞达责任编辑：瑞达科技

Linear 公司的LT3760是集成了升压DC/DC控制器的 8路LED驱动器,能驱动高达45V的LED. 输入电压从6V 到 40V,40mA时的LED匹配电流为±2%,典型值为±0.7%,调光比高达3000:1,可编程的频率从100kHz到1MHz,主要用于汽车,笔记本低电脑和TV监视器的背光.本文介绍LT3760主要特性, 方框图, 36W, 28W, 15W,29W,25W以及14W LED驱动器应用电路.

The LTR3760 is an 8-channel LED driver with a step-up DC/DC controller capable of driving up to 45V of LEDs.

Each channel contains an accurate current sink with ±2% current matching. Channels follow a master programmable current to allow between 20mA to 100mA of LED current per string. Channels can be paralleled for higher LED current. Output voltage adapts to variations in LED VF for optimum efficiency and open LED faults do not affect the operation of connected LED strings.

The LT3760 allows a PWM dimming range up to 3000:1 and an analog dimming range up to 25:1. Operating frequency can be programmed from 100kHz up to 1MHz using a single resistor or synchronized to an external clock.

Additional features include: programmable maximum VOUT for open LED protection, a fault flag for open LED, programmable LED current derating vs temperature, micropower shutdown and internal soft-start. The LT3760 is available in a thermally enhanced 28-pin TSSOP Package.

LT3760主要特性:

Up to 45V of LEDsx 100mA,8-Channel LED Driver

Wide Input Range : 6V to 40V

±2% LED Current Matching at 40mA(Typ ±0.7%)

Up to 3000:1 True Color PWM™ Dimming Range

Single Resistor Sets LED Current (20mA to 100mA)

LED Current Regulated Even for PVIN > VOUT

Output Adapts to LED VF for Optimum Efficiency

Fault Flag + Protection for Open LED Strings

Protection for LED Pin to VOUT Short

Parallel Channels for Higher LED Current

Programmable LED Current Derating vs Temperature

Accurate Undervoltage Lockout Threshold with Programmable Hysteresis

Programmable Frequency (100kHz to 1MHz)

Synchronizable to an External Clock

LT3760应用:

Automotive, Notebook and TV Monitor Backlight