Datasheet > LT3909

LT3909

更新时间： 2024-09-28 14:58:15

品牌	Logo	应用领域
亚德诺 - ADI		驱动驱动器
页数	文件大小	规格书
24页	1358K
描述
具 ±2% 电流匹配准确度的两串 x 60mA、2MHz 升压型 LED 驱动器

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中文翻译

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数据手册

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LT3909 数据手册

LT3909

2-String × 60mA,

2MHz Step-Up LED Driver

with 2ꢀ ꢁCrrent Matching

DESCRIPTION

FEATURES

The LT^®3909 is a 2-string × 60mA LED driver with a fixed

2MHzstep-upDC/DCconvertercapableofdrivingupto36V

of LEDs. Each LED string contains an accurate high-side

current source with 2% current matching. Output volt-

Up to 36V of LEDs, 2-String × 60mA LED Driver

Wide Input Range: 2.9V to 40V

Up to 40,000:1 PWM Dimming (250ns LED On-Time)

(Independent of Leakage at V

2ꢀ LED ꢁurrent Matꢂhing (Tꢃp 0.3ꢀ)

Integrated Sꢂhottkꢃ Diode

)

OUT

age adapts to variations in LED V for optimum efficiency.

Maximum LED current can be programmed from 10mA

to 60mA per string using a single resistor. LED brightness

can be reduced with analog dimming (up to 10:1) or with

PWM dimming (up to 40,000:1 at 100Hz, up to 160:1 at

Internal 400mΩ, 40V, 1A Switꢂh

Single Resistor Sets LED ꢁurrent (10mA to 60mA)

for Both High-Side ꢁurrent Sourꢂes

Output Adapts to LED V for Optimum Efficiency

LED Current Regulated Even for V > V

Fault Flag + Protection for Open-LED and LED-Short-

to-GND (Other String Remains in Regulation)

Programmable Maximum V

Internal Compensation, Soft-Start and Thermal

Regulation

Accurate EN/UVLO Threshold

Fixed 2MHz Switching Frequency

25kHz) (independent of leakage at V ). The LED pins

OUT

can be paralleled for higher LED current.

Additionalfeaturesinclude:programmablemaximumV

OUT

(Regulated)

for open LED protection, a fault flag to indicate open-LED

or LED-short-to-GND and an internal regulation loop to

safelylimitjunctiontemperature.TheLT3909alsoincludes

internalcompensation,internalsoft-startandmicropower

shutdown. The LT3909 is available in the 12-pin (3mm ×

3mm) DFN and 12-pin MSOP packages.

OUT

APPLICATIONS

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PDAs, Handheld Computers

GPS Receivers

Automotive Displays

High Contrast Instrument Clusters

TYPICAL APPLICATION

2-String × 40mA, 2MHz LED Driver for Ten White LEDs/String

LED ꢁurrent Waveforms

20,000:1 PWM Dimming (100Hz)

6.8µH

7V TO 36V

= 12V

1µF

2.2µF

976k

OUT

I(LED1)

20mA/DIV

31.6k

402k

130k

LT3909

EN/UVLO

LED1

LED2

FAULT

I(LED2)

20mA/DIV

PWM

CTRL

PWM

2V/DIV

100k

INTV

GND

SET

10 LEDs

PER STRING

3909 TA01b

400ns/DIV

24.9k

1µF

•

3909 TA01a

3909fb

For more information www.linear.com/LT3909

12 3 4 5 6 7...24

中文翻译

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与LT3909相关器件

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LT3922EUFD	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver
LT3922EUFD#PBF	Linear	获取价格	LT3922 - 36V, 2A Synchronous Step-Up LED Driver; Package: QFN; Pins: 28; Temperature Range
LT3922EUFD#TRPBF	Linear	获取价格	LT3922 - 36V, 2A Synchronous Step-Up LED Driver; Package: QFN; Pins: 28; Temperature Range
LT3922EUFDTRPBF	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver
LT3922HUFD	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver

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