Datasheet > LT3922

LT3922

更新时间： 2024-11-27 14:58:11

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
32页	3246K
描述
36V、2A 同步升压型 LED 驱动器

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LT3922 数据手册

LT3922

36V, 2A Synchronous

Step-Up LED Driver

FEATURES

DESCRIPTION

The LT^®3922 is a monolithic, synchronous, step-up DC/

DC converter that utilizes fixed-frequency, peak current

control and provides PWM dimming for a string of LEDs.

The LED current is programmed by an analog voltage or

the duty cycle of pulses at the CTRL pin. The LT3922 will

maintain 2.ꢀ5 current regulation through an external

sense resistor over a wide range of output voltages.

2ꢀ.% LED ꢁCrrent ꢂeꢃCultion

2% ꢄCtꢅCt Voutlꢃe ꢂeꢃCultion

.000:1 PWM Dimminꢃ lt 100Hz

128:1 Internlu PWM Dimminꢃ

Sꢅreld SꢅectrCm FreqCency ModCultion

Siuent Switcher^®ArchitectCre for Low EMI

ꢄꢅerltes in Boost, BCck Mode lnd BCck-Boost Mode

2.8V to 36V Input Voltage Range

The switching frequency is programmable from 200kHz

to 2MHz by an external resistor at the RT pin or by an

external clock applied at the SYNC/SPRD pin. With the

optional spread spectrum frequency modulation enabled,

the frequency varies from 1005 to 12ꢀ5 to reduce EMI.

The LT3922 also includes a driver for an external high

side PMOS for PWM dimming and an internal PWM signal

generator for analog control of PWM dimming when an

external signal is not available.

Up to 34V LED String Voltage

2A, 40V Internal Switches

200kHz to 2MHz with SYNC Function

Analog or Duty Cycle LED Current Control

Open/Short LED Protection and Fault Indication

Thermally Enhanced 28-Lead (4mm × ꢀmm) QFN

APPLICATIONS

Automotive and Industrial Lighting

Machine Vision

Additional features include an accurate external reference

voltage for use with the CTRL and PWM pins, an LED

current monitor, an accurate EN/UVLO pin threshold,

open-drainfaultreportingforopen-circuitandshort-circuit

load conditions, and thermal shutdown.

All registered trademarks and trademarks are the property of their respective owners.

TYPICAL APPLICATION

2MHz, 93% Efficient 10W (30V, 333mA) Boost LED Driver

Efficiency vs V_IN

ꢀꢁꢁ

33nF

4.7µH

ꢀ

ꢀꢁ

ꢀ ꢁꢂꢃ

ꢀ ꢁꢂꢃꢄ

ꢀꢁꢂ

ꢀ

ꢀꢁ

8V TO 27V

BST

OUT

0.47µF

365k

59.0k

4.7µF

GND

EN/UVLO

OVLO

OUT

LT3922

4.7µF

33.2k

GND

ISP

ꢀꢁꢁꢂ ꢃꢄꢅ ꢆꢇꢈꢉ ꢊꢉꢋꢌe

REF

1µF

100k

ꢀ

ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ

ꢀꢁꢂ

ꢀ

ꢀꢁ

300mΩ

ANALOG DIM

PWM DIM

CTRL

ꢀꢁꢂꢂ ꢃꢄꢅꢆꢇ

PWM

ISN

SYNC/SPRD

INTV

100k

PWMTG

ISMON

FAULT

SS RT

2.2µF

30V

333mA

LED

10k

1nF

45.3k

2MHz

10nF

3922 TA01a

Rev. B

Document Feedback

For more information www.analog.com

12 3 4 5 6 7...32

中文翻译

下载PDF

与LT3922相关器件

型号	品牌	获取价格	描述	数据表
LT3922-1	ADI	获取价格	具有 25,000:1 PWM 调光功能的 36V、2.3A 同步升压型 LED 驱动器
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
LT3922HUFDTRPBF	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver
LT3922IUFD	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver
LT3922IUFDTRPBF	Linear Systems	获取价格	36V, 2A Synchronous Step-Up LED Driver
LT393-0125	ETC	获取价格	PHOTOTRANSISTOR \| NPN \| DOME-3.1

与LT3922相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

45
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

34
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

62
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

59

产品中心

服务支持

精选活动

关于我们

帮助中心

LT3922

LT3922 数据手册

与LT3922相关器件

与LT3922相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LT3922

LT3922 数据手册

与LT3922相关器件

与LT3922相关文章

您还可以找

您在本页遇到什么问题？