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LM3421, LM3421-Q1
LM3423, LM3423-Q1
www.ti.com
SNVS574E – JULY 2008 – REVISED MAY 2013
N-Channel Controllers for Constant Current LED Drivers
Check for Samples: LM3421 , LM3421-Q1 , LM3423 , LM3423-Q1
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FEATURES
DESCRIPTION
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LM3421Q1/LM3423Q1 are Automotive Grade
Products That are AEC-Q100 Grade 1 Qualified
(-40°C to +125°C Operating Junction
Temperature) and Similarly
LM3421Q0/LM3423Q0 are AEC-Q100 Grade 0
Qualified (-40°C to +150°C Operating Junction
Temperature)
V IN Range From 4.5V to 75V
High-Side Adjustable Current Sense
2 ? , 1A Peak MosFET Gate Driver
Input Under-Voltage and Output Over-Voltage
Protection
PWM and Analog Dimming
Cycle-by-Cycle Current Limit
Programmable Switching Frequency
"Zero Current" Shutdown and Thermal
Shutdown
LED Output Status Flag (LM3423/23Q1/23Q0
Only)
Fault Status Flag and Timer
The LM3421/23 are versatile high voltage N-channel
MosFET controllers for LED drivers . They can be
easily configured in buck, boost, buck-boost and
SEPIC topologies. This flexibility, along with an input
voltage rating of 75V, makes the LM3421/23 ideal for
illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for
tight regulation of the LED current with the highest
efficiency possible. The LM3421/23 uses Predictive
Off-time (PRO) control, which is a combination of
peak current-mode control and a predictive off-timer.
This method of control eases the design of loop
compensation while providing inherent input voltage
feed-forward compensation.
The LM3421/23 devices 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
2.0 MHz, thus enabling compact solutions. Additional
features include "zero current" shutdown, analog
dimming, PWM dimming, over-voltage protection,
under-voltage lock-out, cycle-by-cycle current limit,
and thermal shutdown.
(LM3423/23Q1/23Q0 Only)
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
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LED Drivers - Buck, Boost, Buck-Boost, and
driver.
SEPIC
The
LM3421Q1/23Q1
are
AEC-Q100
grade
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Indoor and Outdoor Area SSL
Automotive
General Illumination
Constant-Current Regulators
qualified and LM3421Q0/23Q0 are AEC-Q100 grade
0 qualified.
Typical Boost Application Circuit
V IN
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V IN
EN
COMP
CSH
LM3421
HSN
HSP
RPD
IS
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15
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13
5
6
7
RCT
AGND
OVP
V CC
GATE
PGND
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10
I LED
DAP
PWM
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nDIM
DDRV
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright ? 2008–2013, Texas Instruments Incorporated
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相关代理商/技术参数
LM3423MHX 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM3423MHX/NOPB 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LM3423Q0 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MH 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MH/NOPB 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LM3423Q0MHX 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MHX/NOPB 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
LM3423Q1 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers