TPS40200-EP中文资料(17)

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SGLS371–JANUARY2007

EXAMPLEAPPLICATIONS

Application1:BuckRegulator,8-Vto12-VInput,3.3Vor5Vat2.5-AOutput

Overview

ThebuckregulatordesignshowninFigure31illustratestheuseoftheTPS40200.Itdelivers2.5Aateither3.3Vor5Vasselectedbyasingleresistor.Itachievesapproximately90%efficiencyat3.3Vand94%at5V.AdiscussionofdesigntradeoffsandmethodologyisincludedtoserveasaguidetothesuccessfuldesignofforwardconvertersusingtheTPS40200.

TheBillofMaterials(BOM)forthisapplicationisgiveninTable2TheefficiencyandloadregulationfromboardsbuiltfromthisdesignareshowninFigure32andFigure33Gerberfilesandadditionalapplicationinformationareavailablefromthefactory.

Figure31.8-Vto16-VVINStep-DownBuckConverter

100

100

90

90

Efficiency - %

70

Efficiency - %

80

80

70

60

60

3

50

0.5

1

1.52

Load Current -A

2.5

3

50

0.5

1

1.52

Load Current -A

2.5

Figure32.Full-LoadEfficiencyat5-VVOUTFigure33.Full-LoadEfficiencyat3.3-VVOUT

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