开关电源PCB布局指南
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SIMPLE SWITCHER
®
PCB
քኸళ
AN-1229
www.national.com© 2002 National Semiconductor Corporation AN200426
ெࡔࡔӷڞ༹ࠅິ
ᆌᆩጀ
1229
Sanjaya Maniktala
2002
7
ሆ
SIMPLE SWITCHER
®
PCB
քኸళ
ถ
ጉႀ࠲ᇀ
PCB
քᆌᆩጀᇜڟᅃ߲వ༶
,
ለ܁࿔
ቤڦ߾ײժփٶ໙๑ᆩڦටă ๑ยኁሞۉىׇĂ
EMC
Ă
EMI
ĂۉୟӱิၳᆌĂد၍ၳᆌĂথںڪፕକ
ٷ౮૰ăీዂ૰ᇀዷᄲڦยඪခLjܸքڦඪ
ခାߴጆோڦ
CAD/
քටᇵă փ႞ںLjᆮഄܔᇀ࠲
࿘უഗLjৈ୯Ԩڦք
,
থႠࢅႁ࿚༶ᇺᇺփࠕ
ڦă
ยࢅ
CAD
ටᇵۼႴጀᅪڦ
,
࠲ۉᇸገ࣑ഗڦย
ᇑഄքڦࡻ࣋၎࠲ă
ኄᅜྺ๊থڟٷଉڦ
ࢽۉࣆۼภڟ࠲ۉᇸڦᆌᆩLj்ፌዕۼࡃڟሧߞ
ڦํքăഄํኄၵ࿚༶ሞፌ؛ڦᇱ႙ۉୟӱย้৽ᆌ
ܸᄺᅜՆ௨Ljᅜሞ߳ݛ௬বู้ࢅূബă
PCB
ยڦኝ߲ஃ༶߲၎ړݘڦ༶LjԈઔᅃၵ֪
ڦ
,
ႁڦ
,
ࢅิׂڦ࿚༶LjཞᄣᄺԈઔగዖײ܈ฉڦඹ
ࢅ࿚༶ăසࡕᅜڥ߸ൣؤࢅ߸ศᅃၵLj࣏٪ሞ
༬ۨຕଉڦࢅۉى࿚༶ăڍԨᆌᆩጀڦణڦ௬ၠ
ఫၵፌీ๑ᆩڦ܁ኁă࠶ᆶঢ়ᄓڦยኁ
/CAD
ටᇵ
ᅙঢ়Ԣକፁࠕڦย႑တLjڍԨᆌᆩጀԈࡤକᅃဣଚ
ยۨڦൣؤକڦԨࡀሶLjၭ႐ัںፏთኄၵࡀ߭
ᅜՆ௨ٷଉ࿚༶ڦ၄ă ்࣏༬՚༵ࠃ
ᆌᆩ
LM267x
Lj
LM259x
ࢅ
LM257x
ဣଚ้ླྀڦ؛๔քDŽ
2
Dž
ă࠲ጀڦ
ঋۅெࡔࡔӷڞ༹ڦইუ႙
Simple Switcher
ႊೌLjڍ
၎ཞڦᇱࢇᇀඪࢆྊ೫ࠓࢅ࠲ۉᇸᆌᆩă
Ԩᆌᆩጀ༪ஃڦٷܠຕ࿚༶ኻྷජጣඓԍԨڦۉ
ഘࠀీٳڟႴڦႠీኸՔă ႞ሏںLjኟසݑహڦ࠲ۉ
ᇸยࣷߛ႗ںڥኪLjཚᆶภڦۉഘႠీۼ
၎࠲ڦLjܸᆖၚ൵ᆶ၎ཞڦĐݛၠđă૩ܸჾLj
ᅃ߲Đၙđڦքփৈᆶዺᇀኟඓںํ၄ႊೌࠀీLjܸ
ᄺీณۉىޖพLjݒኮᅨă૩සLj֑ᆩณ࠲ۉୁڦ
࣍ୟ௬ᆶዺᇀ༵ߛ
EMI
ڦኸՔࢅႠీă ܸยᄲጀ
ᅪ
,
ኄዖཚڦĐ൵đࣷ٪ሞᅃၵ૩ྔăኄࣷጣዘ௮
ຎĐޮཟđ߾ᅝLjኄӻዺณิۉߌࢅณሯำᆅഐڦ
IC
࿚༶Ljڍኄᄺࣷሺ
EMI
ă
DŽইუDž
SIMPLE SWITCHER PCB
քࡀሶڦยۨ
a)
ݣዃഭ࿋ܾ࠶ࢅۉඹLjස
2
๖ă
b)
ܔᇀߛഗDŽ૩ස
LM267x
Džփీᅍݣዃཽ᳘
/
ಖୟ༩ٍۉඹDŽ
0.1
μ
F-0.47
μ
F
DžLjස
2
๖ă
c)
සࡕᆶཉLjཚڟথں֫DŽLjሞ
2
ዐՔĎ
X
ďDž
d)
සࡕཚሞ௬ཌྷጎ
(SMT)
ڦۉᇸഗڦࡰಎူݛLjᅜ்ྺĐොඤđă๑ᆩኟඓڦ٫LjᅜՆ௨၄
ิׂ࿚༶ăኁཚࡰಎݣዃLjڍփᄲথዃᇀഄူݛă
e)
ස༪ஃڦఫᄣ
,
ኟඓںքዃݒઍ၍LjᇺሯำᇸLjසۉߌࢅܾ࠶ă
f)
্ኹሞ࠲ۅฉٱဃںሺཟյ܈ă
g)
සࡕഭ࿋ܾ࠶Ⴔᄲᅃ߲ݥٷڦොඤ൶DŽᅙঢ়ኟඓںᇨොඤ൶ᄲ൱DžLjස༪ஃ๖LjႴᄲ๑ᆩ߰ă
h)
ܔᇀ߸ߛࠀ୲ڦ
SMT(
௬ཌྷጎ
)
ᆌᆩLjྺକᆩ߸ณڦཟյ௬ܸڥ߸ࡻڦොඤ࠶Ljᄲ൱๑ᆩ
2
Ӈິڦۉୟӱă
SIMPLE SWITCHER is a Registered Trademark of National Semiconductor.
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