LT3478
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LT3478

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

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Info: : 量产 tooltip
Info: : 量产 tooltip
产品详情
产品模型 8
特性
  • 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
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LT®3478 / LT3478-1 是 4.5A 升压型 DC/DC 转换器,专为以一个恒定电流在很宽的可编程范围内驱动 LED 而设计。LED 的串联连接可提供相同的 LED 电流以实现均匀一致的亮度,而无需镇流电阻器和成本昂贵的出厂校准。

LT3478-1 通过集成 LED 电流检测电阻器减少了外部组件数目并降低了成本。LT3478 采用了一个外部检测电阻器,可把最大可编程 LED 电流扩展至 1A 以上,而且还在设置低 LED 电流时实现了更高的准确度。工作频率能利用一个外部电阻器设定在 200kHz 至高达 2.25MHz 的范围内。独特的电路可提供高达 3000:1 的 PWM 调光范围,同时保持恒定的 LED 彩色。LT3478 / LT3478-1 非常适合于高功率 LED 驱动器应用,例如:汽车 TFT LCD 背光源、踏板照明和平视显示器。两个 CTRL 引脚之一可用于设置最大 LED 电流。另一个 CTRL 引脚可用于根据温度来设置最大 LED 电流的降幅,以尽量扩大 LED 的用途并改善可靠性。

其他特点包括浪涌电流保护、可编程开路 LED 保护和可编程软起动。每款器件可提供 16 引脚耐热性能增强型 TSSOP 封装。


Applications

  • 高功率 LED 驱动器
  • 汽车照明
产品模型 8

产品技术资料帮助

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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。

参考资料

参考资料

产品型号 引脚/封装图-中文版 文档 CAD 符号,脚注和 3D模型
LT3478EFE#PBF
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LT3478EFE#TRPBF
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LT3478EFE-1#PBF
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LT3478EFE-1#TRPBF
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LT3478IFE#PBF
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LT3478IFE#TRPBF
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LT3478IFE-1#PBF
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LT3478IFE-1#TRPBF
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根据型号筛选

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产品生命周期

PCN

4月 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3478EFE#PBF

量产

LT3478EFE#TRPBF

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LT3478EFE-1#PBF

量产

LT3478EFE-1#TRPBF

量产

LT3478IFE#PBF

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LT3478IFE#TRPBF

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LT3478IFE-1#PBF

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LT3478IFE-1#TRPBF

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根据型号筛选

reset

重置过滤器

产品型号

产品生命周期

PCN

4月 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3478EFE#PBF

量产

LT3478EFE#TRPBF

量产

LT3478EFE-1#PBF

量产

LT3478EFE-1#TRPBF

量产

LT3478IFE#PBF

量产

LT3478IFE#TRPBF

量产

LT3478IFE-1#PBF

量产

LT3478IFE-1#TRPBF

量产

软件和型号相关生态系统

软件和型号相关生态系统

评估套件

评估套件 2

reference details image

DC949A-A

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

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DC949A-A

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

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

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

reference details image

DC949A-B

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

zoom

DC949A-B

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

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

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.

工具和仿真

工具及仿真模型 1

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。

启动此部分的现成LTspice演示电路:

1步:下载并在计算机上安装LTspice

2步:单击下面的链接,下载演示电路。

3步:如果在单击以下链接之后LTspice未自动打开,可通过右击该链接并选择“目标另存为”来运行该仿真。将文件保存到计算机之后,请启动LTspice并从“文件”菜单中选择“打开”来打开演示电路。

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