LM3555TLE/NOPB集成电路（IC）的LED驱动器规格书PDF中文资料

LM3555TLE/NOPB属于集成电路（IC）的LED驱动器。由德州仪器制造生产的LM3555TLE/NOPBLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。

1 Features

1• 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 I2C)

• Broken Inductor Detection

• Output Overvoltage Protection

• Output and LED Short-Circuit Protection

• 400-kHz I2C-Compatible Interface

2 Applications

Camera Phone LED Flash

3 Description

The LM3555 is a 2-MHz fixed-frequency, currentmode

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 device.

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 I2C

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 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 overvoltage 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.