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HT7465 датащи(PDF) 6 Page - Holtek Semiconductor Inc

номер детали HT7465
подробное описание детали  2A Step-Down DC to DC Converter
PDF  11 Pages
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7465 датащи(HTML) 6 Page - Holtek Semiconductor Inc

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Rev. 1.00
6
September 02, 2011
HT7465
mustbeusedtoensurestability.Thiscapacitormust
beconnectedveryclosetotheinductor,withshort
tracesforgoodnoiseperformance.
Schottky Diode
Theoutputdiodeconductswhentheinternalpower
MOSFETisswitchedoff.Therearethreeimportant
electricalparameterstoconsiderwhenchoosingthe
diode:
• Thediodemaximumreversevoltagevaluemustbe
greaterthanthemaximuminputvoltage.
• Shortrecoverytimeandlowforwardvoltage--use
aschottkydiodetype.
• Diodecurrentratingshouldbegreaterthanthe
maximumloadcurrent.
Layout Considerations
Circuitboardlayoutisaveryimportantconsideration
for switching regulators if they are to function
properly.Poorcircuitlayoutmayresultinrelated
noise problems. In order to minimise EMI and
switchingnoise,followtheguidelinesbelow:
• Alltracksshouldbeaswideaspossible.
• Theinputandoutputcapacitors,C1(C8)andC6
(C7),shouldbeplacedclosetotheVIN,VOUT
andGNDpins(C1andC8isparallel;C6andC7is
parallel).
• TheSchottkydiodeDandinductorLmustbe
placedclosetotheSWpin.
• Feedbackresistor,R1(R1-1)andR2,mustbe
placedclosetotheFBandGNDpins(R1andR1-1
isseries).
• Afullgroundplaneisalwayshelpfulforbetter
EMIperformance.
ArecommendedPCBlayoutwithcomponent
locationsisshownbelow.
SOP8 Top Layer
SOP8 Bottom Layer
MSOP10 Top Layer
MSOP10 Bottom Layer



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