Datasheet > LM3421Q1MHX

LM3421Q1MHX

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
48页	1323K
描述
N-Channel Controllers for Constant Current LED Drivers

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LM3421Q1MHX 数据手册

January 21, 2010

LM3421

LM3421Q1 LM3421Q0

LM3423

LM3423Q1 LM3423Q0

N-Channel Controllers for Constant Current LED Drivers

General Description

Features

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 flexibili-

ty, along with an input voltage rating of 75V, makes the

LM3421/23 ideal for illuminating LEDs in a large family of ap-

plications.

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_INrange from 4.5V to 75V

■

Adjustable high-side current sense voltage allows for tight

regulation of the LED current with the highest efficiency pos-

sible. 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.

High-side adjustable current sense

2Ω, 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

The LM3421/23 devices include a high-voltage startup regu-

lator 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 solu-

tions. Additional features include "zero current" shutdown,

"Zero current" shutdown and thermal shutdown

LED output status flag (LM3423/23Q1/23Q0 only)

Fault status flag and timer (LM3423/23Q1/23Q0 only)

analog dimming, PWM dimming, over-voltage protection, un- Applications

der-voltage lock-out, cycle-by-cycle current limit, and thermal

shutdown.

LED Drivers - Buck, Boost, Buck-Boost, and SEPIC

■

Indoor and Outdoor Area SSL

Automotive

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.

General Illumination

Constant-Current Regulators

The LM3421Q1/23Q1 are AEC-Q100 grade 1 qualified and

LM3421Q0/23Q0 are AEC-Q100 grade 0 qualified.

Typical Boost Application Circuit

300673b6

Boost Evaluation Board

9 Series LEDs at 1A

300673k9

300673

www.national.com

12 3 4 5 6 7...48

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与LM3421Q1MHX相关器件

型号	品牌	获取价格	描述	数据表
LM3421Q1MHX/NOPB	TI	获取价格	具有串联 DIM FET 驱动器的汽车类 N 沟道恒流 LED 控制器 \| PWP \| 1
LM3423	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3423	TI	获取价格	具有串联 DIM FET 驱动器和故障标志功能的 N 沟道恒流 LED 驱动器控制器
LM3423_11	NSC	获取价格	LM3423 Buck-Boost 2 Layer Evaluation Board evaluation board showcases most features
LM3423MH	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3423MH/NOPB	TI	获取价格	具有串联 DIM FET 驱动器和故障标志功能的 N 沟道恒流 LED 驱动器控制器 \|
LM3423MHX	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3423MHX/NOPB	TI	获取价格	具有串联 DIM FET 驱动器和故障标志功能的 N 沟道恒流 LED 驱动器控制器 \|
LM3423Q0	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MH	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers

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