Datasheet > LM3421_11

LM3421_11

更新时间： 2024-11-23 12:20:19

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器
页数	文件大小	规格书
20页	6823K
描述
LM3421 SEPIC LED Driver Evaluation Board for Automotive Applications

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LM3421_11 数据手册

National Semiconductor

Application Note 2009

Steve Solanyk

LM3421 SEPIC LED Driver

Evaluation Board for

Automotive Applications

February 4, 2011

Introduction

Key Features

This application note describes an evaluation board consist-

ing of the LM3421 controller configured as a SEPIC constant

current LED driver. It is capable of converting input voltages

from 8V to 18V and illuminating up to six LEDs with approxi-

mately 350mA of drive current.

•

Designed to CISPR-25, Class 3 limits

0 to 10V analog dimming function

PWM dimming function

Input under-voltage protection

Over-voltage protection

Additional features include analog and pulse-width modulated

(PWM) dimming, over-voltage protection, under-voltage lock-

out and cycle-by-cycle current limit.

Cycle-by-cycle current limit

NoPB and RoHS compliant bill of materials

A bill of materials is included that describes the parts used in

this evaluation board. A schematic and layout have also been

included along with measured performance characteristics.

Applications

•

Emergency lighting modules

LED light-bars, beacons and strobe lights

Automotive tail-light modules

Performance Specifications

Based on an LED V_f= 3.15V

Symbol

V_IN

Parameter

Min

Typ

Max

Operating Input Supply Voltage

Input Supply Voltage Surge Voltage

LED String Voltage

V_IN(MAX)

V_OUT

I_LED

50 V

18.9V (6 LEDs)

345 mA

85.4%

LED String Average Current

Efficiency (V_IN=12V, I_LED=345mA, 6 LEDs)

Switching Frequency

f_SW

132 kHz

< 1% Variation

2.5 A

LED Current Regulation

Current Limit

I_LIMIT

V_UVLO

V_UVLO(HYS)Input Undervoltage Lock-out Hysteresis

Input Undervoltage Lock-out Threshold (V_INRising)

7.2V

V_OVP

Output Over-Voltage Protection Threshold

Output Over-Voltage Protection Hysteresis

37 V

V_OVP(HYS)

3.5 V

Demo Board

30107546

301075

www.national.com

12 3 4 5 6 7...20

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与LM3421_11相关器件

型号	品牌	获取价格	描述	数据表
LM342-100.000M	CONNOR-WINFIELD	获取价格	Oscillator
LM342-100.00M	CONNOR-WINFIELD	获取价格	LVDS Output Clock Oscillator, 100MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC PACKAGE
LM342-155.52M	CONNOR-WINFIELD	获取价格	5.0x7.0mm Surface Mount LVDS Clock Oscillator Series
LM3421MH	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421MH/NOPB	TI	获取价格	具有串联 DIM FET 驱动器的 N 沟道恒流 LED 驱动器控制器 \| PWP \| 1
LM3421MHX	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421MHX/NOPB	TI	获取价格	具有串联 DIM FET 驱动器的 N 沟道恒流 LED 驱动器控制器 \| PWP \| 1
LM3421Q0	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421Q0MH	NSC	获取价格	N-Channel Controllers for Constant Current LED Drivers
LM3421Q0MH/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

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