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LT3518HFE-TRPBF PDF预览

LT3518HFE-TRPBF

更新时间: 2024-09-26 05:43:31
品牌 Logo 应用领域
凌特 - Linear 驱动器开关
页数 文件大小 规格书
20页 270K
描述
Full-Featured LED Driver with 2.3A Switch Current

LT3518HFE-TRPBF 数据手册

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LT3518  
Full-Featured LED Driver  
with 2.3A Switch Current  
FEATURES  
DESCRIPTION  
The LT®3518 is a current mode DC/DC converter with an  
internal 2.3A, 45V switch specifically designed to drive  
LEDs. The LT3518 operates as a LED driver in boost, buck  
mode and buck-boost mode. It combines a traditional  
voltage loop and a unique current loop to operate as a  
constant-current source or constant-voltage source. Pro-  
grammableswitchingfrequencyallowsoptimizationofthe  
externalcomponentsforefficiencyorcomponentsize.The  
switching frequency of the LT3518 can be synchronized  
to an external clock signal. The LED current is externally  
programmable with a 100mV sense resistor. The external  
PWM input provides 3000:1 LED dimming. The CTRL pin  
provides further 10:1 dimming ratio.  
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3000:1 True Color PWMDimming Ratio  
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2.3A, 45V Internal Switch  
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100mV High Side Current Sense  
Open LED Protection  
Adjustable Frequency: 250kHz to 2.5MHz  
Wide Input Voltage Range:  
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Operation from 3V to 30V  
Transient Protection to 40V  
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Operates in Boost, Buck Mode and Buck-Boost Mode  
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Gate Driver for PMOS LED Disconnect*  
Constant-Current and Constant-Voltage Regulation  
CTRL Pin Provides 10:1 Analog Dimming  
Low Shutdown Current: <1μA  
Available in (4mm × 4mm) 16-Lead QFN and 16-Pin  
TSSOP Packages  
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The LT3518 is available in the tiny footprint 16-Lead QFN  
(4mm×4mm)andthe16-PinTSSOPpackage.TheLT3518  
provides a complete solution for both constant-voltage  
and constant-current applications.  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color  
PWM is a trademark of Linear Technology Corporation. Patent Pending. All other trademarks are  
the property of their respective owners. *Patents Pending.  
APPLICATIONS  
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Display Backlighting  
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Automotive and Avionic Lighting  
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Illumination  
Scanners  
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TYPICAL APPLICATION  
1.5A Buck Mode LED Driver  
Efficiency  
100  
10μF  
68mΩ  
M1  
CTRL = V  
REF  
PV  
IN  
24V  
90  
2.2μF  
1.5A  
15μH  
80  
70  
ISP  
ISN TG  
V
IN  
V
SW  
IN  
3.3V  
2.2μF  
SHDN  
LT3518  
V
60  
50  
40  
CTRL  
PWM  
FB  
REF  
PWM  
SS  
SYNC  
TGEN V  
R
T
GND  
V
REF  
C
16.9k  
1MHz  
0
20  
40  
60  
80  
100  
0.1μF  
0.1μF  
PWM DUTY CYCLE (%)  
3518 TA01a  
3518 TA01b  
3518fb  
1

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