高达3A电流的LED升降压转换器(安森美).pdf

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高能效降压-升压转换器设计注释,输入电压范围5至28V,以高达3 A电流驱动LED串。
DNO5002/D Schematic a立 zu0,nz m工。 √ ∧v m四 Start-up May 2011, rev. 0 Www. onseml com DNO5002/D w ta vecw Moog t Der onon M Me Me Mcoe Ma um w F Tek Drain Voltage Output voltage 1轴%a 因e飞 29.nMN so2as's 20v4 tMa气2M A0211 Transient Response For this test, a second load was switched on and off in parallel with the main load. the converter successfully maintains a constant output current. The transient spikes are totally acceptable since this application does not require a fast response Drain Voltage Output Current Bo/LAt RU1038 Coat Aute April, 2011 t7:135 Output Current Adjustment May 2011, rev. 0 Www. onseml com 4 DN05002/D Output current is set by resistor R2 which can be chosen according to the table below lout (A) R2(9) 187 1.5 267 348 511 Key Features Seamless "buck to boost transition High efficiency Constant output current · Simplicity References Data sheet NTMFS5844NL: 60V, 60 A, 12 m Ohm Single N-Channel Power MOSFET in SO-8FL Data sheet NCP3020: 28V Synchronous Buck Controller C 201 1 ON Semiconductor Disclaimer: ON Semiconductor is providing this design note"AS IS and does not assume any liability arising from its use; nor does on Semiconductor convey any license to its or any third party' s intellectual property rights. This document is provided only to assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its products at any time, without notice Design note created by Michael Borza, e-mail: mborza@onsemi com May 2011, rev. 0 Www.onsEmi.com

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