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LT3922

更新时间： 2023-12-20 18:45:55
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

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中文翻译

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LT3922 数据手册

 浏览型号LT3922的Datasheet PDF文件第2页浏览型号LT3922的Datasheet PDF文件第3页浏览型号LT3922的Datasheet PDF文件第4页浏览型号LT3922的Datasheet PDF文件第5页浏览型号LT3922的Datasheet PDF文件第6页浏览型号LT3922的Datasheet PDF文件第7页 
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.  
n
2ꢀ.% LED ꢁCrrent ꢂeꢃCultion  
n
2% ꢄCtꢅCt Voutlꢃe ꢂeꢃCultion  
n
.000:1 PWM Dimminꢃ lt 100Hz  
128:1 Internlu PWM Dimminꢃ  
n
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 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.  
n
Up to 34V LED String Voltage  
n
2A, 40V Internal Switches  
n
200kHz to 2MHz with SYNC Function  
n
Analog or Duty Cycle LED Current Control  
n
Open/Short LED Protection and Fault Indication  
n
Thermally Enhanced 28-Lead (4mm × ꢀmm) QFN  
APPLICATIONS  
n
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.  
n
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 VIN  
L1  
ꢀꢁꢁ  
33nF  
4.7µH  
ꢀ
ꢀꢁ  
ꢀ ꢁꢂꢃ  
ꢀ ꢁꢂꢃꢄ  
ꢀꢁꢂ  
ꢀ
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
ꢀꢁ  
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  
1M  
LT3922  
FB  
4.7µF  
33.2k  
GND  
ISP  
ꢀꢁꢁꢂ ꢃꢄꢅ ꢆꢇꢈꢉ ꢊꢉꢋꢌe  
V
REF  
1µF  
100k  
ꢀ
ꢀ
ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ ꢀꢁ  
ꢀꢁꢂ  
ꢀ
ꢀꢁ  
300mΩ  
ANALOG DIM  
PWM DIM  
CTRL  
ꢀꢁꢂꢂ ꢃꢄꢅꢆꢇ  
PWM  
ISN  
SYNC/SPRD  
INTV  
CC  
100k  
PWMTG  
ISMON  
M1  
FAULT  
SS RT  
RP  
V
C
2.2µF  
30V  
333mA  
LED  
10k  
1nF  
45.3k  
2MHz  
10nF  
3922 TA01a  
Rev. B  
1
Document Feedback  
For more information www.analog.com  
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