采用MAX16834設(shè)計(jì)的112W升壓LED驅(qū)動(dòng)器技術(shù)
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時(shí)間：2012-05-31
來(lái)源：網(wǎng)絡(luò)
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技術(shù)方案與實(shí)用技巧
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(zhǎng)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(zhǎng)串LED驅(qū)動(dòng)器參考設(shè)計(jì)外形圖
圖9.112W升壓長(zhǎng)串LED驅(qū)動(dòng)器參考設(shè)計(jì)電路圖
112W升壓長(zhǎng)串LED驅(qū)動(dòng)器參考設(shè)計(jì)材料清單(BOM):
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