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LM3421MHX PDF预览

LM3421MHX

更新时间: 2024-11-23 05:42:03
品牌 Logo 应用领域
美国国家半导体 - NSC 驱动器控制器
页数 文件大小 规格书
24页 885K
描述
N-Channel Controllers for Constant Current LED Drivers

LM3421MHX 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:LEED FREE, TSSOP-16Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.27接口集成电路类型:LED DISPLAY DRIVER
JESD-30 代码:R-PDSO-G16JESD-609代码:e0
长度:5 mm湿度敏感等级:1
复用显示功能:NO功能数量:1
区段数:1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:HSSOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH
峰值回流温度(摄氏度):260认证状态:Not Qualified
最大供电电压:75 V最小供电电压:4.5 V
标称供电电压:14 V表面贴装:YES
温度等级:AUTOMOTIVE端子面层:Tin/Lead (Sn85Pb15)
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:40
宽度:4.4 mmBase Number Matches:1

LM3421MHX 数据手册

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January 26, 2009  
LM3421, LM3423  
N-Channel Controllers for Constant Current LED Drivers  
General Description  
Features  
The LM3421/LM3423 devices are versatile high voltage LED  
driver controllers. With the capability to be configured in a  
Buck, Boost, Buck-Boost (Flyback), or SEPIC topology, and  
an input operating voltage rating of 75V, these controllers are  
ideal for illuminating LEDs in a very diverse, large family of  
applications.  
VIN range from 4.5V to 75V  
2% Internal reference voltage (1.235V)  
Current sense voltage adjustable from 20mV  
High-side current sensing  
2Ω MOSFET gate driver  
Dimming MOSFET gate driver  
Input under-voltage protection  
Over-voltage protection  
Adjustable high-side current sense with a typical sense volt-  
age of 100mV allows for tight regulation of the LED current  
with the highest efficiency possible. Output LED current reg-  
ulation is based on peak current-mode control with predictive  
Off-Time Control. This method of control eases the design of  
loop compensation while providing inherent input voltage  
feed-forward compensation.  
Low shutdown current, IQ < 1µA  
Fast (50kHz) PWM dimming  
Cycle-by-cycle current limit  
The LM3421/LM3423 include a high-voltage startup regulator  
that operates over a wide input range of 4.5V to 75V. The  
internal PWM controller is designed for adjustable switching  
frequencies of up to 2.0MHz, thus enabling compact solu-  
tions. Additional features include: “zero” current shutdown,  
precision reference, logic compatible DIM input suitable for  
fast PWM dimming, cycle-by-cycle current limit, and thermal  
shutdown.  
Programmable switching frequency  
LED output status flag (LM3423 only)  
Fault timer pin (LM3423 only)  
TSSOP EP 16-lead package (LM3421)  
TSSOP EP 20-lead package (LM3423)  
Applications  
The LM3423 also includes an LED output status flag, a fault  
flag, a programmable fault timer, and a logic input to select  
the polarity of the dimming output driver.  
LED Drivers  
Constant-Current Buck-Boost Regulator  
Constant-Current Boost Regulator  
Constant-Current Flyback Regulator  
Constant-Current SEPIC Regulator  
Thermo-Electric Cooler (Peltier) Driver  
Typical Application Circuit  
30067331  
Boost LED Driver  
© 2009 National Semiconductor Corporation  
300673  
www.national.com  

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