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    188宝金博页面版: 【精品】boost 120w

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    内容提示： Maxim > App Notes > Display Drivers LED Lighting Power-Supply Circuits Keywords: LED, boost, string, MAX1 6834, high voltage, step-up, driver, ceramic capacitors, high-dimming ratio, streetlight, garage lightingJun 28, 201 0APPLICATION NOTE 4669112W Boost Driver for Long Strings of LEDs Using All CeramicCapacitorsBy: Jim Christensen, Strategic Applications EngineerAbstract: This reference design uses the MAX16834 to create a high-powered LED driver for a very long string(s) of LEDs. TheLED current i...

    文档格式：PDF | 页数：12 | 浏览次数：64 | 上传日期：2014-03-12 21:00:55 | 文档星级：
    Maxim > App Notes > Display Drivers LED Lighting Power-Supply Circuits Keywords: LED, boost, string, MAX1 6834, high voltage, step-up, driver, ceramic capacitors, high-dimming ratio, streetlight, garage lightingJun 28, 201 0APPLICATION NOTE 4669112W Boost Driver for Long Strings of LEDs Using All CeramicCapacitorsBy: Jim Christensen, Strategic Applications EngineerAbstract: This reference design uses the MAX16834 to create a high-powered LED driver for a very long string(s) of LEDs. TheLED current is adjustable with a potentiometer, and can be set as high as 1.5A into as many as 20 LEDs (75V total). For longlife, ceramic capacitors are used for both input and output decoupling.This is a reference design for a 1 1 2.5W boost LED driver that uses the MAX1 6834 for long strings of LEDs. These long LEDstrings 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 is750mA 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 1 00Hz dimming frequencyNote: this design has been built and tested. However, detailed testing has not occurred and there may benuances that have yet to be discovered.More detailed image (PDF, 7.6MB)Figure 1. The LED driver board.Page 1 of 1 2

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