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LT3492IUFDTRPBF

更新时间： 2024-01-21 06:11:38
品牌 Logo 应用领域
凌特 - Linear 驱动器
页数 文件大小 规格书
20页 324K
描述
Triple Output LED Driver with 3000:1 PWM Dimming

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中文翻译

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LT3492IUFDTRPBF 数据手册

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LT3492  
Triple Output LED Driver  
with 3000:1 PWM Dimming  
DESCRIPTION  
The LT®3492 is a triple output DC/DC converter designed  
to operate as a constant-current source and is ideal for  
driving LEDs. The LT3492 works in buck, boost or buck-  
boost mode. The LT3492 uses a fixed frequency, current  
mode architecture resulting in stable operation over a  
wide range of supply and output voltages. A frequency  
adjust pin allows the user to program switching frequency  
between 330kHz and 2.1MHz to optimize efficiency and  
external component size.  
FEATURES  
n
True Color PWM™ Dimming Delivers Up to 3000:1  
Dimming Ratio  
n
Built-In Gate Driver for PMOS LED Disconnect  
n
Three Independent Driver Channels with 600mA,  
60V Internal Switches  
n
Operates in Buck, Boost, Buck-Boost Modes  
n
CTRL Pin Accurately Sets LED Current Sense  
Threshold Over a Range of 10mV to 100mV  
n
Adjustable Frequency: 330kHz to 2.1MHz  
n
Open LED Protection  
Wide Input Voltage Range:  
The external PWM input provides 3000:1 LED dimming  
on each channel. Each of the three channels has a built-in  
gate driver to drive an external LED-disconnect P-channel  
MOSFET,allowinghighdimmingrange.Theoutputcurrent  
range of each channel of the LT3492 is programmed with  
an external sense resistor.  
n
Operation from 3V to 30V  
Transient Protection to 40V  
n
Surface Mount Components  
n
28-Lead (4mm × 5mm) QFN and TSSOP Packages  
The CTRL pin is used to adjust the LED current either for  
analog dimming or overtemperature protection.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 7199560, 7321203, and others pending.  
APPLICATIONS  
n
RGB Lighting  
n
Billboards and Large Displays  
n
Automotive and Avionic Lighting  
n
Constant-Current Sources  
TYPICAL APPLICATION  
High Dimming Ratio Triple Output Buck-Mode LED Power Supply  
PV  
IN  
58V  
1μF  
s3  
ISP1  
330mΩ  
ISN1  
ISP2  
330mΩ  
ISN2  
ISP3  
330mΩ  
ISN3  
3000:1 PWM Dimming at 100Hz  
TG1  
TG2  
TG3  
PWM  
5V/DIV  
10 LEDs  
0.3A  
0.3A  
0.3A  
0.47μF  
I
LED  
0.2A/DIV  
0.47μF 0.47μF  
I
L
0.5A/DIV  
33μH  
33μH  
33μH  
3492 TA01b  
1μs/DIV  
SW1  
SW2  
SW3  
TG1-3  
ISP1-3  
ISN1-3  
V
V
CTRL1-3  
C1-3  
REF  
V
IN  
3V TO 24V  
V
IN  
PWM1-3  
SHDN  
1μF  
10k  
680pF  
150k  
LT3492  
GND  
FADJ  
49.9k  
1.3MHz  
OVP1-3  
3492 TA01a  
3492f  
1
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