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LT3496

更新时间： 2024-11-05 14:58:03
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
20页 337K
描述
三通道输出 LED 驱动器

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中文翻译

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LT3496 数据手册

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LT3496  
Triple Output LED Driver  
Features  
Description  
The LT®3496 is a triple output DC/DC converter designed  
to operate as a constant-current source and is ideal for  
driving LEDs. The LT3496 works in buck, boost or buck-  
boost mode. The LT3496 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.  
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 750mA,  
45V 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  
The LT3496 supports 3000:1 dimming control on each  
channel. Each of the three regulators is independently  
operated by that channel’s PWM signal. The PWM feature  
allows precise adjustment of the color mixing or dimming  
ratio of the LED source. Each of the three channels has  
a built-in gate driver to drive an external LED-disconnect  
P-channel MOSFET, allowing high dimming range. The  
output current range of each channel of the LT3496 is  
programmed with an external sense resistor.  
n
Wide V Supply Range:  
IN  
Operation from 3V to 30V  
Transient Protection to 40V  
n
n
Surface Mount Components  
28-Lead (4mm × 5mm) QFN and TSSOP Packages  
applications  
n
RGB Lighting  
n
Billboards and Large Displays  
The CTRL pins are used to adjust the LED currents either  
for analog dimming or overtemperature protection.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
ThinSOT and True Color PWM are trademarks 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.  
n
Automotive and Avionic Lighting  
Constant-Current Sources  
n
typical application  
High Dimming Ratio Triple Output LED Power Supply  
PV  
IN  
42V  
1µF  
s3  
CAP1  
200mΩ  
LED1  
CAP2  
200mΩ  
LED2  
CAP3  
200mΩ  
LED3  
3000:1 PWM Dimming at 120Hz  
TG1  
TG2  
TG3  
PWM  
5V/DIV  
7 LEDs  
0.5A  
0.5A  
0.5A  
I
L
0.5A/DIV  
I
LED  
0.5A/DIV  
0.47µF 0.47µF  
0.47µF  
18µH  
18µH 18µH  
3496 TA01b  
0.5µs/DIV  
SW1  
SW2  
SW3  
TG1, TG2, TG3  
VC1, VC2, VC3  
CAP1, CAP2, CAP3  
LED1, LED2, LED3  
V
REF  
22k  
470pF  
LT3496  
GND  
V
IN  
V
CTRL1, CTRL2, CTRL3  
IN  
3V TO 24V  
PWM1, PWM2, PWM3  
SHDN  
PWM1, PWM2, PWM3  
SHDN  
f
ADJ  
OVP1, OVP2, OVP3  
1µF  
3496 TA01a  
3496ff  
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