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LT3517

更新时间： 2024-09-24 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 274K
描述
Full-Featured LED Driver with 1.5A Switch Current

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中文翻译

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LT3517 数据手册

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LT3517  
Full-Featured LED Driver  
with 1.5A Switch Current  
FEATURES  
DESCRIPTION  
5000:1 True Color PWMTM Dimming Ratio  
The LT®3517 is a current mode DC/DC converter with an  
internal 1.5A, 45V switch specifically designed to drive  
LEDs. The LT3517 operates as a LED driver in boost,  
buck mode and buck-boost mode. It combines a tradi-  
tional voltage loop and a unique current loop to operate  
as a constant-current source or constant-voltage source.  
Programmableswitchingfrequencyallowsoptimizationof  
theexternalcomponentsforefficiencyorcomponentsize.  
The switching frequency of LT3517 can be synchronized  
to an external clock signal. The LED current is externally  
programmable with a 100mV sense resistor. The external  
PWMinputprovidesupto5000:1LEDdimming.TheCTRL  
pin provides further 10:1 dimming ratio.  
■
■
1.5A, 45V Internal Switch  
■
100mV High Side Current Sense  
■
Open LED Protection  
■
Adjustable Frequency: 250kHz to 2.5MHz  
■
Wide Input Voltage Range:  
Operation from 3V to 30V  
Transient Protection to 40V  
■
Operates in Boost, Buck Mode and Buck-Boost Mode  
■
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  
■
■
■
■
The LT3517 is available in the tiny footprint 16-Lead QFN  
(4mm×4mm)andthe16-PinTSSOPpackages.TheLT3517  
provides a complete solution for both constant-voltage  
and constant-current applications.  
APPLICATIONS  
■
Display Backlighting  
, 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.  
■
Automotive and Avionic Lighting  
■
Illumination  
Scanners  
■
TYPICAL APPLICATION  
1A Buck Mode LED Driver  
Efficiency  
100  
CTRL = V  
REF  
10μF  
100mΩ  
PV  
IN  
90  
24V  
2.2μF  
1A  
80  
70  
15μH  
ISP  
ISN TG  
V
IN  
V
SW  
IN  
3.3V  
2.2μF  
SHDN  
LT3517  
60  
50  
40  
V
CTRL  
PWM  
FB  
REF  
PWM  
SS  
SYNC  
R
T
GND  
TGEN V  
V
REF  
C
0
20  
40  
60  
80  
100  
16.9k  
1MHz  
PWM DUTY CYCLE (%)  
0.1μF  
0.1μF  
3517 TA01b  
3517 TA01a  
3517fa  
1
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