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LM3555 - 产品图解：
LM3555-具有 500 mA 高侧 LED 驱动器和双模控制接口的同步升压转换器
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TI产品 - LM3555介绍

LM3555 - 具有 500 mA 高侧 LED 驱动器和双模控制接口的同步升压转换器

LM3555是TI德州仪器公司的一款相机闪光灯LED驱动器产品，LM3555是具有 500 mA 高侧 LED 驱动器和双模控制接口的同步升压转换器，本站介绍了LM3555的封装应用图解、特点和优点、功能等，并给出了与LM3555相关的TI元器件型号供参考。

LM3555 - 具有 500 mA 高侧 LED 驱动器和双模控制接口的同步升压转换器 - 相机闪光灯LED驱动器 - LED驱动器 - 德州仪器

产品描述

The LM3555 is a 2 MHz fixed frequency, current mode synchronous boost converter designed to drive either a single flash LED at 500 mA or two series flash LEDs at 400 mA. A high-voltage current source allows the LEDs to be terminated to the GND plane eliminating the need for an additional return trace back to the IC.

A dual mode control interface allows the user to configure the LM3555 with a general-purpose interface using two enable pins for control or an I 2C allowing a higher level of control. Both interfaces allow access to the indicator, assist light and flash modes. A dedicated Strobe pin provides a direct interface to trigger the flash event, while an external Torch pin provides an additional method for enabling the LEDs in a constant current mode.

The LM3555 can adaptively scale the maximum flash level delivered to the LED/LEDs based upon the flash configuration, whether it be a single LED or two LEDs in series.

Eight protection features are available on the LM3555 ranging from over-voltage protection to broken inductor detection. The LM3555 has four selectable inductor current limits to help the user select an inductor that is appropriate for the design.

产品特性

  • High-Voltage High-Side Current Source Allows for Grounded Cathode LED Operation
  • Synchronous Boost Converter
  • Peak Converter Efficiency >90%
  • Accurate and Programmable LED Current ranging from 60 mA to 500 mA
  • Adaptive LED Current Range Based on LED Configuration
  • Dedicated Indicator Current Source
  • Dedicated Torch and Strobe Pins
  • Dual Mode Control (General Purpose or I 2C)
  • Broken Inductor Detection
  • Output Over-Voltage Protection
  • Output and LED Short-Circuit Protection
  • 400kHz I 2C-Compatible Interface
  • 12-Bump, 1.575 mm x 2.1 mm x 0.6 mm micro SMD Package (TLA12BCA)

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