LT3478

量产

具 True Color PWM 调光功能的 4.5A、单片式 LED 驱动器

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产品模型
8
产品技术资料帮助

ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许，也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。
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产品详情

  • True Color PWM™ 调光可提供恒定的 LED 彩色和高达 3000:1 的调光范围
  • 宽输入电压范围：2.8V 至 36V
  • 4.5A、60mΩ、42V 内部开关
  • 能够以升压、降压-升压或升压模式驱动 LED
  • 集成型电阻器用于电感器和 LED 电流检测
  • 设置 LED 电流：
    • 100mA 至 1050mA (LT3478-1)
    • (10mV 至 105mV) / RSENSE (LT3478)
  • 可根据温度设置 LED 电流降额
  • 分离的电感器电源输入
  • 浪涌电流保护
  • 可编程软起动
  • 固定频率操作：200kHz 至 2.25MHz
  • 开路 LED 保护 (可编程 OVP)
  • 具可编程迟滞的准确停机/UVLO 门限
  • 16 引脚耐热性能增强型 TSSOP 封装
LT3478
具 True Color PWM 调光功能的 4.5A、单片式 LED 驱动器
Automotive TFT LCD Backlight Efficiency vs VIN Product Package 1
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参考资料

数据手册 2

可靠性数据 1

用户手册 1

技术文章 1

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硬件生态系统

部分模型 产品周期 描述
TimerBlox 1
LTC6992-1
量产 TimerBlox : 电压控制型脉宽调制器 (PWM)
多通道电压输出数模转换器 1
LTC2657
量产 具 10ppm/ºC 最大值基准的八通道 I2C 16 位轨至轨 DAC
浪涌抑制器、过压和过流保护 1
LT4363
推荐新设计使用 具电流限制功能的高电压浪涌抑制器
数字温度传感器 1
LTC2991
推荐新设计使用 8 通道 I2C 电压、电流和温度监视器
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工具及仿真模型

LTspice 2

LTspice中提供以下器件型号：

  • LT3478
  • LT3478-1
LTspice

LTspice®是一款强大高效的免费仿真软件、原理图采集和波形观测器，为改善模拟电路的仿真提供增强功能和模型。

评估套件

eval board
schematic 1
DC949A-A

LT3478EFE-1 Demo Board | Boost LED Driver, Internal RSENSE, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

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产品详情

Demonstration circuit 949A is a 4.5A peak switch current boost LED driver with PWM dimming featuring the LT3478/LT3478-1. The LT3478 can be used for boost, buck mode, and buck-boost mode LED drivers. DC949A-A includes the LT3478-1, a fixed 1A boost LED driver with the LED current sense resistor inside the IC. DC949A-B features the LT3478 adjustable current boost LED driver; it requires an external sense resistor (R11). Both circuits are optimized to drive a 350mA LED string with a total LED voltage above the input voltage and below 40V (overvoltage protection is set between 36V and 40V).


The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for VLED >25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving

eval board
schematic 2
DC949A-B

LT3478EFE Demo Board | Boost LED Driver, Adjustable LED Current, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA

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产品详情

Demonstration circuit 949A is a 4.5A peak switch current boost LED driver with PWM dimming featuring the LT3478/LT3478-1. The LT3478 can be used for boost, buck mode, and buck-boost mode LED drivers. DC949A-A includes the LT3478-1, a fixed 1A boost LED driver with the LED current sense resistor inside the IC. DC949A-B features the LT3478 adjustable current boost LED driver; it requires an external sense resistor (R11). Both circuits are optimized to drive a 350mA LED string with a total LED voltage above the input voltage and below 40V (overvoltage protection is set between 36V and 40V).


The IC's input voltage range is 2.8V to 16V and the LED power input voltage range is 2.8V to 25V (for VLED > 25V). With an internal 4.5A NPN power switch, floating current sense amplifier, LED current PWM dimming control, inrush current protection, programmable switching frequency, soft-start, and overvoltage protection, the LT3478-1/LT3478 are extremely powerful and versatile LED driving ICs.
DC949A-A
LT3478EFE-1 Demo Board | Boost LED Driver, Internal RSENSE, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA
DC949A-A - Schematic
DC949A-B
LT3478EFE Demo Board | Boost LED Driver, Adjustable LED Current, 2.8V ≤ VIN ≤ 25V, VLED up to 36V @ 350mA
DC949A-A - Schematic

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