业界寻找升降压LED DRIVER解决方案

输入是AC8~36V,50~60HZ,输出是12V~14V,电流是310~750mA可调,有方案者请提供支持,量大!!

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fengjje

LV.2

2009-10-19 11:54

我有方案可做,加我QQ214527962

michelhcn

LV.2

2009-10-19 12:05

大家看清楚了,是一个案子里面同时兼容升降压的,不要以为很容易做!没有很强的技术背景不要随便说"完全没有问题"

dennisyql

LV.2

2009-10-19 12:08

@michelhcn

大家看清楚了,是一个案子里面同时兼容升降压的,不要以为很容易做!没有很强的技术背景不要随便说"完全没有问题"

我是有一颗可以做升降压的驱动IC,目前已有客户在量产.13714765317,杨先生

zheb8000

LV.4

2009-10-19 21:06

LM3423 应用LED升降压驱动方案
LM3423芯片适用于高达75V的输入电压,可升降压应用,
可出高达20个1W串接 LED,应用太阳能路灯等,效率90以上;
       VIN range from 4.5V to 75V
2% 1.25V Internal reference voltage
Current sense voltage adjustable from 50mV to 1.25V
High side current sensing
750mA peak MOSFET gate driver
Dimming MOSFET gate driver
Input under-voltage protection
Output over-voltage protection
LED ready flag
Low shutdown current, Iq < 1?A
Fast (50 KHz) PWM dimming input
Cycle-by-cycle current limit
Programmable running frequency
Fault timer pin
TSSOP-20 package
        Applications
LED Drivers
Constant Current Buck-Boost Regulator
Constant Current Boost Regulator
Constant Current Flyback Regulator
Constant Current SEPIC Converter
Thermo-Electric Cooler (Peltier) Driver

SHENZHEN  TEL:(0)13760313075;
Email:ZHEB8110@163.COM;
MSN:ZHEB8110@hotmail.com;

500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/82/1367671255957588.gif');}" onmousewheel="return imgzoom(this);">

bjst1

LV.3

2009-10-20 08:29

动下脑筋,不要动不动就寻找什么好方案,不要动不动就去找哪个IC 这个IC
要学会用常用的元件加些技巧就可以代替昂贵的IC
我推荐用两个UC3843就可以做了,

jerry.lin

LV.1

2009-10-20 08:36

@bjst1

动下脑筋,不要动不动就寻找什么好方案,不要动不动就去找哪个IC这个IC要学会用常用的元件加些技巧就可以代替昂贵的IC我推荐用两个UC3843就可以做了,

BUCK boost拓朴就可以了,IC就太多了.

kin1945

LV.7

2009-10-20 10:17

此帖已被删除

kin1945

LV.7

2009-10-20 10:25

@kin1945

此帖已被删除

发以张图供参考 149691256005538.pdf

michelhcn

LV.2

2009-10-21 00:01

@zheb8000

LM3423应用LED升降压驱动方案LM3423芯片适用于高达75V的输入电压,可升降压应用,可出高达20个1W串接LED,应用太阳能路灯等,效率90以上; VINrangefrom4.5Vto75V2%1.25VInternalreferencevoltageCurrentsensevoltageadjustablefrom50mVto1.25VHighsidecurrentsensing750mApeakMOSFETgatedriverDimmingMOSFETgatedriverInputunder-voltageprotectionOutputover-voltageprotectionLEDreadyflagLowshutdowncurrent,Iq<1?AFast(50KHz)PWMdimminginput Cycle-by-cyclecurrentlimitProgrammablerunningfrequencyFaulttimerpinTSSOP-20package ApplicationsLEDDriversConstantCurrentBuck-BoostRegulatorConstantCurrentBoostRegulatorConstantCurrentFlybackRegulatorConstantCurrentSEPICConverterThermo-ElectricCooler(Peltier)DriverSHENZHEN TEL:(0)13760313075;Email:ZHEB8110@163.COM;MSN:ZHEB8110@hotmail.com;[图片]500){this.resized=true;this.width=500;this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}"onclick="if(!this.resized){returntrue;}else{window.open('http://u.dianyuan.com/bbs/u/82/1367671255957588.gif');}"onmousewheel="returnimgzoom(this);">

LM3423这个升降压案子我了解过,一是贵,二是低压部分并不理想,特别是输入9V以下的时候.