Datasheet > LM3555

LM3555

更新时间： 2024-02-15 06:39:21

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器转换器升压转换器
页数	文件大小	规格书
2页	118K
描述
Synchronous Boost Converter with 500 mA High Side LED Driver and Dual-Mode Control Interfacev

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LM3555 数据手册

January 15, 2009

LM3555 PRODUCT BRIEF

Synchronous Boost Converter with 500 mA High Side LED

Driver and Dual-Mode Control Interface

General Description

Features

The LM3555 is a 2 MHz fixed frequency, current mode syn-

chronous 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.

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

60mA to 500mA

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 inter-

face to trigger the flash event, while an external Torch pin

provides an additional method for enabling the LEDs in a

constant current mode.

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 Over-Voltage Protection

Output and LED Short-Circuit Protection

400kHz I²C Compatible Interface

The LM3555 can adaptively scale the maximum flash level

delivered to the LED/LEDs based upon the flash configura-

tion, whether it be a single LED or two LEDs in series.

12–Bump, 1.575 mm x 2.1 mm x 0.6 mm micro SMD

Package (TLA12BCA)

■

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.

Applications

Camera Phone LED Flash

■

Typical Application Circuits

30079401

300794

www.national.com

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与LM3555相关器件

型号	品牌	获取价格	描述	数据表
LM3555TLE/NOPB	TI	获取价格	具有 500mA 高侧 LED 驱动器和双模式控制接口的同步升压转换器 \| YZR \| 1
LM3555TLX/NOPB	TI	获取价格	具有 500mA 高侧 LED 驱动器和双模式控制接口的同步升压转换器 \| YZR \| 1
LM3556	TI	获取价格	1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
LM3556_14	TI	获取价格	1.5A Synchronous Boost LED Flash Driver w/ High-Side Current Source
LM3556TME/NOPB	TI	获取价格	LM3556 1.5A 感应式白光 LED 相机闪存器件 \| YFQ \| 16 \| -40
LM3556TMX/NOPB	TI	获取价格	LM3556 1.5A 感应式白光 LED 相机闪存器件 \| YFQ \| 16 \| -40
LM3557	NSC	获取价格	Step-Up Converter for White LED Applications
LM3557	TI	获取价格	Step-Up Converter for White LED Applications
LM3557SD-2	NSC	获取价格	Step-Up Converter for White LED Applications
LM3557SD-2	TI	获取价格	1.1A SWITCHING REGULATOR, 1600kHz SWITCHING FREQ-MAX, PDSO8, 1 MM HEIGHT, LLP-8

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