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ʱ䣺2016-08-10 08:40:54 ࣺ

 ȫֵԴȱʹʼнӵܺı׼ԽԽϸ񣬶ڵԴʦθЧʡܵĵԴһսĴӵԴIJֳŻSIMPLE SWITCHERԴܵѲַʵ

ڹ滮ԴʱҪǵص··ȻڵԴЩ·˽·Եĵ·ԺҪΪǻ⡣ͼ1ʾĻ·1УԵͨ·(Cin1)ڸ߶MOSFETijͨʱھMOSFETڲ·(CO1)󷵻·

 

ͼ1 Դл·ʾͼ

 

·2ڲ߶MOSFETĹضʱԼͶMOSFETĵͨʱγɵġڲд洢·͵ͶMOSFET󷵻GNDͼ1ʾ·ص򣨰·ı߽磩Ϊdi/dtתṩƵԼʹƵԴ·ĹУ·(Cin1)Źؼá

·(Co1)Ȼϴȴ䵱ĸƵ˲ԭӦþԵVINVOUTŷáͼ2ʾʹ·ԵVINVOUT֮߾̲ɽЩӲĵн͡

 

ͼ2 SIMPLE SWITCHER·

 

еĵнͣôһ,ͨٽCin1CO1֮ĴԪܡ⽫ȷõĸƵ·di/dtĵʽѹֵͬ͡ʱܽ͵ѹӦͣȷڶ󻯽EMI

ӸټеĵͻֳԸƵʵĵ迹ԣӶٴ䡣ʹմɵX7RX5RESR͵ֻнĵݷڿGNDVINʱӵĸݲܷáSIMPLE SWITCHERԴ龭أеͷʹEMIѭĽܵIJָ룬øܡ

··滮ӣŻԴȴŹؼá⣬ӦþCin1CO1֮Ľӵߣֱ㺸̣ھнϴ(Cin1)ӵΪҪ

нӵصţ㺸̣Լ裬ӦϵĻ·㡣˻·Ϊе͵ķ·ԼĽ̸ɢװʹá

 

ͼ3 鼰Ϊ迹ʾͼ

 

ҲӦھܿFBŵλϡҪ˸迹ڵϵDZȡֵͣFB뷴мͷ֮߾ܶҪġõIJǰӦ÷ھܿϲ㷴λϡ

ɢȽ

Ľղڵôͬʱɢ˸Ӱ죬ֵĹҪӸСĿռɢǵһ⣬SIMPLE SWITCHERԴװıһĴ㺸̣ԵʽӵءúڴڲMOSFETͨ󲿷ṩ͵迹

Ӱ뵼ᵽЩװ迹(θJC)Ϊ1.9/WȻﵽҵȵθJCֵͺ룬װ迹(θCA)̫ʱθJCֵҲûṩΧͨĵ迹ɢ·ͻۼ㺸޷ɢôʲôθCAֵ㺸̵ȫԼصɢƬĿơ

˽һνвɢƬļɢȣͼ3ʾ鼰Ϊ迹ġӽᵽƬ̵迹ȣڽװ迹ԽϸߣڵһιƴӽᵽΧ(θJT)ʱǿԺθJAɢ·

ɢȵĵһȷҪɢĹʡݱйЧͼ(η)ɼĵĹ(PD)

Ȼʹе¶TAmbientͶTJunction(125)¶ԼȷϷװ衣

ʹñ棨͵ײϾδ𻵵һ˾ͭɢƬɢȿףĶȴݵ򻯵Ľֵȷɢİ

 

İֵδǵɢȿӵãЩɢȿ׽Ӷ㣨װײ㴫ݡײڶ㣬ԴォϵͳȥΪʹֵЧʹ810ɢȿסɢȿ׵зʽֵ

˽ֱֵΪ12ܶͭΪ0.5˾ĵֱͨס㺸·ҪܶһЩɢȿףʹЩɢȿ11.5mmļγС

SIMPLE SWITCHERԴΪӦԸӵĵԴԼֱ/ֱתصĵ͵IJṩȻѱһЩ̹Աõ·ɢŻܡ

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