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LT3922IUFD

更新时间： 2024-11-24 01:03:23
品牌 Logo 应用领域
Linear Systems /
页数 文件大小 规格书
30页 2491K
描述
36V, 2A Synchronous Step-Up LED Driver

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LT3922IUFD 数据手册

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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 2ꢀcurrentregulationthroughanexternalsense  
resistor over a wide range of output voltages.  
n
2% LED ꢀCrrent ꢁeꢂCultion  
n
2% ꢃCtꢄCt Voutlꢂe ꢁeꢂCultion  
n
5000:1 PWM Dimminꢂ lt 100Hz  
128:1 Internlu PWM Dimminꢂ  
n
n
Sꢄreld-SꢄectrCm FreqCency ModCultion  
Siuent Switcher® ArchitectCre for Low EMI  
n
n
ꢃꢄerltes 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  
optionalSpreadSpectrumFrequencyModulationenabled,  
the frequency varies from 100ꢀ to 125ꢀ to reduce EMI.  
The LT3922 also includes a driver for an external high-  
side PFET 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-Pin (4mm × 5mm) 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
L, LT, LTC, LTM, Linear Technology, the Linear logo and Silent Switcher are registered  
trademarks of Linear Technology Corporation. All other trademarks are the property of their  
respective owners. Protected by U.S. Patents, including 7199560, 7321203, and other patents  
pending.  
Typical applicaTion  
2MHz, 93% Efficient 10W (30V, 333mA) Boost LED Driver  
Efficiency vs VIN  
L1  
100  
0.1µF  
4.7µH  
V
SW  
= 30V  
= 2MHz  
LED  
f
95  
90  
85  
80  
75  
70  
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  
100% PWM Duty Cycle  
V
REF  
1µF  
100k  
6
9
12 15 18 21 24 27 30  
(V)  
V
IN  
300mΩ  
ANALOG DIM  
PWM DIM  
CTRL  
3922 TA01b  
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  
3922f  
1
For more information www.linear.com/LT3922  
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