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LT3755IUD-2#PBF

产品描述IC LED DRIVER CTRLR DIM 16QFN
产品类别模拟混合信号IC    驱动程序和接口   
文件大小340KB,共26页
制造商Linear ( ADI )
官网地址http://www.analog.com/cn/index.html
标准
下载文档 详细参数 全文预览

LT3755IUD-2#PBF概述

IC LED DRIVER CTRLR DIM 16QFN

LT3755IUD-2#PBF规格参数

参数名称属性值
Brand NameLinear Technology
是否Rohs认证符合
零件包装代码QFN
包装说明HVQCCN, LCC16,.12SQ,20
针数16
制造商包装代码UD
Reach Compliance Codecompliant
ECCN代码EAR99
Is SamacsysN
接口集成电路类型LED DISPLAY DRIVER
JESD-30 代码S-PQCC-N16
JESD-609代码e3
长度3 mm
湿度敏感等级1
复用显示功能NO
功能数量1
区段数14
端子数量16
最高工作温度125 °C
最低工作温度-40 °C
封装主体材料PLASTIC/EPOXY
封装代码HVQCCN
封装等效代码LCC16,.12SQ,20
封装形状SQUARE
封装形式CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度(摄氏度)260
电源24 V
认证状态Not Qualified
座面最大高度0.8 mm
最大供电电压40 V
最小供电电压4.5 V
标称供电电压24 V
表面贴装YES
技术BIPOLAR
温度等级AUTOMOTIVE
端子面层Matte Tin (Sn)
端子形式NO LEAD
端子节距0.5 mm
端子位置QUAD
处于峰值回流温度下的最长时间30
宽度3 mm
Base Number Matches1

文档预览

下载PDF文档
LT3755/LT3755-1/LT3755-2
40V
IN
, 75V
OUT
LED Controllers
FeaTures
3000:1 True Color PWM™ Dimming
n
Wide Input Voltage Range: 4.5V to 40V
n
Output Voltage Up to 75V
n
Constant-Current and Constant-Voltage Regulation
n
100mV High Side Current Sense
n
Drives LEDs in Boost, Buck Mode, Buck-Boost Mode,
SEPIC or Flyback Topology
n
Adjustable Frequency: 100kHz to 1MHz
n
Open LED Protection
n
Programmable Undervoltage Lockout with Hysteresis
n
Improved Open LED Status Pin (LT3755-2)
n
Frequency Synchronization (LT3755-1)
n
PWM Disconnect Switch Driver
n
CTRL Pin Provides Analog Dimming
n
Low Shutdown Current: <1µA
n
Programmable Soft-Start
n
Thermally Enhanced 16-Lead QFN (3mm
×
3mm)
and MSOP Packages
n
DescripTion
The LT
®
3755, LT3755-1 and LT3755-2 are DC/DC control-
lers designed to operate as a constant-current source for
driving high current LEDs. They drive a low side external
N-channel power MOSFET from an internal regulated 7.15V
supply. The fixed frequency, current mode architecture
results in stable operation over a wide range of supply
and output voltages. A ground referenced voltage FB pin
serves as the input for several LED protection features,
and also makes it possible for the converter to operate
as a constant-voltage source. A frequency adjust pin
allows the user to program the frequency from 100kHz
to 1MHz to optimize efficiency, performance or external
component size.
The LT3755/LT3755-1/LT3755-2 sense output current at
the high side of the LED string. High side current sensing
is the most flexible scheme for driving LEDs, allowing
boost, buck mode or buck-boost mode configuration.
The PWM input provides LED dimming ratios of up to
3000:1, and the CTRL input provides additional analog
dimming capability.
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.
applicaTions
n
n
n
High Power LED
Battery Chargers
Accurate Current Limited Voltage Regulators
Typical applicaTion
50W White Automotive LED Headlamp Driver
V
IN
8V TO
40V
22µH
4.7µF
1M
185k
V
IN
SHDN/UVLO
V
REF
332k
CTRL
INTV
CC
100k
40.2k
LT3755-2
ISN
GATE
OPENLED
PWM
SS
PWMOUT
RT
V
C
GND INTV
CC
10k
0.001µF
37551 TA01a
Efficiency vs V
IN
100
1M
4.7µF
FB
ISP
0.1
1A
23.7k
96
EFFICIENCY (%)
50W
LED
STRING
92
SENSE
88
0.015
84
80
0.01µF
28.7k
375kHz
4.7µF
0
10
20
V
IN
(V)
30
40
37551 TA01b
37551fd

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