Datasheet > LT3932

LT3932

更新时间： 2024-11-27 01:23:19

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
30页	1173K
描述
36V, 2A Synchronous Step-Down LED Driver

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中文翻译

获取价格

数据手册

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LT3932 数据手册

LT3932/LT3932-1

36V, 2A Synchronous

Step-Down LED Driver

FEATURES

DESCRIPTION

The LT^®3932 is a monolithic, synchronous, step-down

DC/DCconverterthatutilizesfixed-frequency,peakcurrent

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. An output volt-

age limit can be set with a resistor divider to the FB pin.

±±1.5 LED ꢀCrrent ꢁegClatiꢂn

±±125 ꢃCtꢄCt ꢅꢂltage ꢁegClatiꢂn

.000:±/±0000+:± PWM Dimming at ±00Hz

(LT3932/LT3932-±)

±28:± Internal PWM Dimming

Sꢄread-SꢄectrCm FreqCency MꢂdClatiꢂn

Silent Switcher^®ArchitectCre fꢂr Lꢂw EMI

Theswitchingfrequencyisprogrammablefrom200kHzto

2MHzbyanexternalresistorattheRTpinorbyanexternal

clock at the SYNC/SPRD pin. With the optional spread

spectrum frequency modulation enabled, the frequency

varies from 100% to 125% to reduce EMI. The LT3932

also includes a driver for an external, high side PMOS for

PWM dimming and an internal PWM signal generator for

analogcontrolofPWMdimmingwhenanexternalsignalis

notavailable.TheLT3932-1permitshigherdimmingratios.

3.6V to 36V Input Voltage Range

0V to 36V LED String Voltage

200kHz to 2MHz with SYNC Function

99.9% Maximum Duty Cycle

Analog or Duty Cycle LED Current Control

Open/Short LED Protection and Fault Indication

Accurate LED Current Sense with Monitor Output

Programmable UVLO

Thermally Enhanced 28-Pin (4mm ꢀ 5mm) QFN

Additional features include an LED current monitor, an

accurate EN/UVLO pin threshold, open-drain fault report-

ing for open-circuit and short-circuit load conditions, and

thermal shutdown.

APPLICATIONS

Automotive Lighting

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

by U.S. Patents including 7199560, 7321203, 9596728, 9642200 and other patents pending.

Industrial and General Purpose Lighting

Machine Vision Systems

TYPICAL APPLICATION

2A LED Driver with Internal PWM Dimming

INTV

Internal PWM Dimming

12V

BST

8.2µH

22nF

274k

OUT

2x1µF

EN/UVLO

10µF

OUT 9V 1A

30.1k

20V/DIV

110k

OUT

LT3932

PWMTG

10V/DIV

100µF

10k

REF

GND

ISP

100k

CTRL

PWM

1A/DIV

2.2µF

100k

ILED

1A/DIV

50mΩ

3932 TA01b

INTV

ISN

PWM = 1.078V

(8% PWM DUTY RATIO)

2µs/DIV

PWMTG

ISMON

FAULT

SYNC/SPRD

ISMON

RT RP

45.3k

2MHz

28.7k

7.8kHz

162k

10nF

100nF

3932 TA01a

3932fa

For more information www.linear.com/LT3932

12 3 4 5 6 7...30

中文翻译

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与LT3932相关器件

型号	品牌	获取价格	描述	数据表
LT3932-1	Linear	获取价格	36V, 2A Synchronous Step-Down LED Driver
LT3932EUFD-1#PBF	Linear	获取价格	LT3932/LT3932-1- 36V, 2A Synchronous Step-Down LED Driver; Package: QFN; Pins: 28; Tempera
LT3932HUFD-1#PBF	Linear	获取价格	LT3932/LT3932-1- 36V, 2A Synchronous Step-Down LED Driver; Package: QFN; Pins: 28; Tempera
LT3932IUFD-1#PBF	Linear	获取价格	LT3932/LT3932-1- 36V, 2A Synchronous Step-Down LED Driver; Package: QFN; Pins: 28; Tempera
LT3935	ADI	获取价格	集成Silent Switcher的36V、4A同步降压LED驱动器
LT3942	ADI	获取价格	36V、2A同步降压-升压转换器和LED驱动器
LT3950	ADI	获取价格	60V, 1.5A LED Driver with Internal Exponential Scale Dimming
LT3950EMSE	ADI	获取价格	60V, 1.5A LED Driver with Internal Exponential Scale Dimming
LT3950JMSE	ADI	获取价格	60V, 1.5A LED Driver with Internal Exponential Scale Dimming
LT3952	ADI	获取价格	60V, 1.5A LED Driver with Internal Exponential Scale Dimming

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