采用MAX16834設(shè)計(jì)的112W升壓LED驅(qū)動(dòng)器技術(shù)

時(shí)間：2012-05-29 08:16:55

關(guān)鍵字： LED驅(qū)動(dòng)器升壓 FOR

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[導(dǎo)讀]MAX16834 是電流模式高亮LED(HBLED)驅(qū)動(dòng)器,可用于升壓,升壓-降壓,SEPIC和高邊降壓拓?fù)? 工作電壓4.75V 到 28V,3000:1 PWM調(diào)光/模擬調(diào)光,可編頻率從100kHz到1MHz,主要用在單串LED LCD背光,汽車前后照明,投映系統(tǒng)RGB L

MAX16834 是電流模式高亮LED(HBLED)驅(qū)動(dòng)器,可用于升壓,升壓-降壓,SEPIC和高邊降壓拓?fù)? 工作電壓4.75V 到 28V,3000:1 PWM調(diào)光/模擬調(diào)光,可編頻率從100kHz到1MHz,主要用在單串LED LCD背光,汽車前后照明,投映系統(tǒng)RGB LED光源,點(diǎn)和環(huán)境照明以及DC/DC升壓/升-降壓轉(zhuǎn)換器.本文介紹了MAX16834主要特性,方框圖,多種應(yīng)用電路以及112W升壓LED驅(qū)動(dòng)器參考設(shè)計(jì),電路圖和材料清單(BOM).

圖1.MAX16834內(nèi)部方框圖

圖2.MAX16834升壓LED驅(qū)動(dòng)器

圖3.MAX16834升壓-降壓LED驅(qū)動(dòng)器(VLED+ < 28V)

圖4.MAX16834帶汽車負(fù)載突變保護(hù)的升壓LED驅(qū)動(dòng)器

圖5.MAX16834高邊降壓LED驅(qū)動(dòng)器[!--empirenews.page--]

圖6.MAX16834升壓DC/DC轉(zhuǎn)換器

圖7.MAX16834升壓-降壓DC/DC轉(zhuǎn)換器

全陶瓷電容的112W升壓長串LED驅(qū)動(dòng)器參考設(shè)計(jì)

112W boost driver for long strings of LEDs using all ceramic capacitors

This is a reference design for a 112.5W boost LED driver that uses the MAX16834 for long strings of LEDs. These long LED strings are commonly found in streetlights and parking garage lights.

Input voltage: 24VDC ±5% (at 1.49A)

VLED configuration: Two parallel strings. Each string consists of 19 WLEDs and a 5Ω resistor for current balancing. Current is 750mA per sting for a total of 1.5A into 75V.

Dimming: 50μs (min) on-pulse for up to a 200:1 dimming ratio with a 100Hz dimming frequency

圖8.112W升壓長串LED驅(qū)動(dòng)器參考設(shè)計(jì)外形圖

圖9.112W升壓長串LED驅(qū)動(dòng)器參考設(shè)計(jì)電路圖

112W升壓長串LED驅(qū)動(dòng)器參考設(shè)計(jì)材料清單(BOM):