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LT3922-1

更新时间： 2024-11-24 14:57:27
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
34页 3202K
描述
具有 25,000:1 PWM 调光功能的 36V、2.3A 同步升压型 LED 驱动器

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中文翻译

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LT3922-1 数据手册

 浏览型号LT3922-1的Datasheet PDF文件第2页浏览型号LT3922-1的Datasheet PDF文件第3页浏览型号LT3922-1的Datasheet PDF文件第4页浏览型号LT3922-1的Datasheet PDF文件第5页浏览型号LT3922-1的Datasheet PDF文件第6页浏览型号LT3922-1的Datasheet PDF文件第7页 
LT3922-1  
36V, 2.3A Synchronous Step-Up  
LED Driver with 25,000:1 PWM Dimming  
FEATURES  
DESCRIPTION  
The LT®3922-1 is a monolithic, synchronous, step-up DC/  
DC converter that utilizes fixed-frequency, peak current  
n
2ꢀ5ꢁ LED ꢂCrrent ꢃegCultion  
n
2ꢁ ꢄCtꢅCt Voutlge ꢃegCultion  
n
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 LT3922-1  
willmaintain 2.ꢀ5currentregulationthroughanexternal  
sense resistor over a wide range of output voltages.  
25,000:1 PWM Dimming lt 100Hz  
n
128:1 Internlu PWM Dimming  
n
Sꢅreld SꢅectrCm FreqCency ModCultion  
Siuent Switcher® ArchitectCre for Low EMI  
n
n
ꢄꢅerltes in Boost, BCck Mode lnd BCck-Boost Mode  
n
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 LT3922-1 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 available, the LT3922-1 can perform  
2ꢀ,000:1 PWM dimming with 100Hz PWM pulses.  
n
Up to 34V LED String Voltage  
n
2.3A, 40V Internal Switches  
n
200kHz to 2MHz Switching Frequency with SYNC  
n
Analog or Duty Cycle LED Current Control  
n
Open/Short LED Protection and Fault Indication  
n
Thermally Enhanced 28-Lead (4mm × ꢀmm) QFN  
n
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
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.  
n
Automotive and Industrial Lighting  
Machine Vision  
n
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 7199ꢀ60, 7321203, and other patents pending.  
TYPICAL APPLICATION  
30V, 333mA Boost LED Driver with 25,000:1 PWM Dimmming  
L1, 2.2µH  
33µF  
V
IN  
8V TO 27V  
SW  
BST  
V
V
IN  
OUT  
0.47µF  
0.47µF  
1M  
365k  
59.0k  
4.7µF  
GND  
EN/UVLO  
OVLO  
V
OUT  
FB  
ꢀ
ꢁꢂꢃ  
ꢄꢅꢅꢆAꢇꢃꢀꢈ  
1M  
LT3922-1  
10µF  
33.2k  
GND  
ISP  
V
REF  
ꢀ
ꢁꢂꢃ  
ꢄꢀꢅꢆꢇꢀ  
1µF  
CTRL  
PWM  
300mΩ  
SYNC/SPRD  
ISN  
INTV  
CC  
ꢀꢁꢁꢂꢃꢄꢅꢆꢇ  
ꢀꢁꢂꢀꢁꢀꢃꢄ ꢅꢄRꢆꢀꢆꢃꢄꢁꢇꢄ  
ꢉ ꢊꢋꢈ  
100k  
PWMTG  
ISMON  
M1  
ꢀꢁꢂꢂꢃ ꢄAꢅꢃꢆ  
ꢈ
ꢀꢁ  
FAULT  
ꢌ
ꢉ ꢊꢏꢏꢐꢑ  
ꢅꢍꢎ  
SS RT  
RP  
V
C
2.2µF  
30V  
333mA  
LED  
51k  
1nF  
45.3k  
2MHz  
10nF  
L1: WURTH 74437324022  
M1: VISHAY Si2319CDS  
39221 TA01a  
Rev. A  
1
Document Feedback  
For more information www.analog.com  
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