MLCC Yakatsanangurwa: Tsanangudzo, Mhando & Sarudzo Yekutungamira muPCBA

ziviso

MLCC (Multilayer Ceramic Capacitor) inomiririra chikamu chakanyanya kupararira mumaseketi emagetsi emazuva ano, inodarika 30% yezvikamu zvese pamaPCB chaiwo. Yayo compact tsoka, kuvimbika kwepamusoro, uye scalable capacitance hunhu hunoita kuti ive yakakosha pane ese maapplication kubva kumagetsi ekupa decoupling kusvika kune yakakwira-frequency chiratidzo chekugadzirisa. Mumazuva ano madiki emagetsi, kusarudzwa kweMLCC kunokanganisa zvakananga kuita kwedunhu, kugadzikana, uye kuvimbika kwechigadzirwa chose.

Chii chinonzi MLCC: Core Concepts

MLCC Chimiro uye Kuumbwa

Iyo multilayer ceramic capacitor ine inochinjana mitsara yeceramic dielectric zvinhu uye conductive simbi maelectrodes, akaturikidzana kuti awane yakakwirira capacitance munzvimbo diki. Kupera kwekunze kunobatanidza aya emukati maelectrode, achigadzira yakaderera-profile chikamu chakakodzera gungano repamusoro-soro. Ichi chivakwa chinogonesa MLCC kuunza yepamusoro frequency mhinduro kana ichienzaniswa neye electrolytic dzimwe nzira.

Mabasa Ekutanga muElectroniki Circuits

MLCC inoshandisa mabasa mana akakosha: kuchengetedza simba, kusefa ruzha rusingadiwe, kubatanidza magetsi emagetsi, uye kudzikamisa magetsi pamamiriro ekushanda. Iyo ceramic dielectric inopa kukurumidza kuchaja-kuburitsa mitsetse yakakosha kune yakakwira-frequency application. Kusiyana nepolarized capacitors, MLCC inoshanda bidirectionally, ichiita kuti ive yakanaka kune AC coupling uye chiratidzo chekugadzirisa zvikumbiro uko polarity isingagone kuvimbiswa.

MLCC Mhando uye Zvikamu

Dielectric Material Categories

MLCC capacitance uye kugadzikana kunosiyana zvakanyanya zvichienderana nekuumbwa kwedielectric. NP0/C0G mhando dzinopa yakasarudzika tembiricha kugadzikana ine padyo-zero tembiricha coefficient, zvichiita kuti ive yakakwana kune chaiyo nguva uye kusefa maseketi. X7R uye X5R dielectrics inopa yakakwira capacitance density apo ichichengetedza kugadzikana kunonzwisisika pamaindasitiri ekushisa. Mhando dzeY5V dzinounza huwandu hwepamusoro asi dzinosangana nekusiyana kwakakura netembiricha uye voltage, zvichidzimisa kune isiri-yakakosha maapplication.

Package Size Standards

Yakajairwa MLCC tsoka dzinotangira pa01005 (0.4mm × 0.2mm) kusvika 2220 (5.7mm × 5.0mm), ine 0402, 0603, 0805, uye 1206 mapakeji anotonga magadzirirwo ekutengesa. Madiki mapakeji anokodzera yakakwirira-density nhare mbozha asi inoda chaiyo yekuisa midziyo uye nekungwarira kutonga kwemafuta. Mapakeji akakura anobata akakwira voltages uye macurrents apa achipa zvirinani mechanic kugadzikana panguva yekuungana uye kushanda.

Mashandisirwo-Marudzi Akananga

Ma capacitor anobvisa magetsi anodzikamisa magetsi emuno nekushandisa magetsi enguva pfupi, ukuwo ma capacitor ekusefa achideredza huwandu hwema frequency munzira dzemasaini. Mhando dze MLCC dzine voltage yakakura dzinotsigira mashandisirwo anosvika ma kilovolts akati wandei, kunyange saizi chaiyo ichikwirawo. Mhando dzeMLCC dzakasimbiswa nekuchengetedzeka dzinosangana nezvinodiwa zvakasimba zvekushandisa kwekurapa nemotokari uko nzira dzekukundikana dzinofanira kufanotaurwa.

MLCC Key Parameters uye Hunhu

Capacitance Kukosha uye Kushivirira

Makoshero emhando yepamusoro eMLCC anotevera E6 kana E12 series, nemvumo inotangira pa ±1% yemhando dzeC0G kusvika ±20% ye high-K dielectrics. Mamiriro ekushanda anokanganisa zvakanyanya capacitance chaiyo, kunyanya DC bias voltage uye tembiricha. Mainjiniya anofanirwa kufunga nezvekukanganiswa kwakanyanya pakuverenga capacitance inodiwa pakushandiswa kwakakosha.

Voltage Rating uye Derating

MLCC voltage ratings inoratidza yakanyanya kuchengetedzeka yekushanda voltage pasi pemamiriro akatsanangurwa, asi inochengetedza dhizaini yedhizaini inoshanda 50% inodzikisira pakushanda kwakavimbika kwenguva refu. Kupfuura rated voltage inomhanyisa kuderedzwa kwe dielectric uye inowedzera njodzi yekutadza. Iyo DC bias mhedzisiro inodudzwa mune yakakwira-K dielectrics, uko kushandiswa kwemagetsi kunogona kuderedza inoshanda capacitance ne80% kana kupfuura payakayerwa voltage.

Temperature Coefficient uye Drift

Tembiricha coefficient inotsanangura capacitance shanduko padhigirii Celsius, inoratidzwa muppm/°C pamhando dzakatsiga kana semabhendi ekushivirira kune zvemhando yepamusoro-K. C0G inochengetedza ± 30ppm/°C kumativi ayo akazara, nepo X7R inosiyana ± 15% kubva -55°C kusvika +125°C. Hunhu uhu hunotaridza kukodzera kweMLCC kune tembiricha-inonzwa maapplication senge oscillator uye chaiyo analogi maseketi.

Frequency Mhinduro: ESR uye ESL

Equivalent Series Resistance (ESR) uye Equivalent Series Inductance (ESL) inotonga MLCC kushanda pamhepo huru. Yakaderera ESR inovandudza kusefa uye inoderedza kupera kwesimba, nepo shoma ESL inowedzera inobatsira frequency renji. Aya maparasitic anogadzira iyo yega-resonant frequency kupfuura iyo iyo MLCC inobata inductively pane capacitively, ichidzikamisa kushanda kwayo.

MLCC Sarudzo Yekutungamira yePCB Dhizaini

Kuongorora Zvinodiwa Nedunhu

Kusarudza MLCC kunoshanda kunotanga nekunzwisisa zvinodiwa nedunhu: kupatsanura mafrequency akawanda kunoda ESL neESR yakaderera, kusefa kwakawanda kunoda capacitance yakakura, uye mashandisirwo akarurama anoda kugadzikana kwetembiricha. Kupatsanura magetsi kunowanzo sanganisa akawanda maMLCC values ​​kuti avhare mafrequency akafara, sezvo ma capacitor ega ega asingakwanise kugadzirisa mafrequency ese panguva imwe chete.

Voltage uye Capacitance Matching

Verenga huwandu hwemagetsi anoshanda anosanganisira anochinja uye ripple, wobva wasarudza MLCC ine inokwana 2 × yakayerwa voltage yekushanda kwakavimbika. Account yeDC bias effect nekusarudza yekutanga capacitance 1.5-2 × yakakwirira kupfuura inodiwa, kunyanya neX7R uye X5R dielectrics. Kudzikisira uku kunoita kuti capacitance yakakwana irambe iri pasi pemamiriro chaiwo ekushanda.

Package uye Rongedzo Kufunga

PCB nzvimbo inomanikidza, kupisa kwekuwedzera coefficients, uye kugona kwegungano kunokanganisa kusarudzwa kwepakeji. Mapakeji madiki anoderedza PCB nzvimbo asi anowedzera kukonzeresa kushushikana kwemagetsi panguva yekutengesa uye bhodhi kushanduka. Mechisa MLCC nePCB yekuwedzera kupisa maitiro ekudzikisa njodzi yekupwanya, kunyanya nezvikamu zvakakura kana maitiro ekupisa kwepamusoro.

Kuvimbika uye Kurarama Hurefu Zvinhu

Kuvimbika kweMLCC kunoenderana nekushushikana kwevoltage, tembiricha bhasikoro, mechanical dhiri, uye zvakatipoteredza zvinhu. Kudzikisira kwakaringana kunowedzera hupenyu hwekushanda zvakanyanya, nepo kushushikana kwakanyanya kunowedzera kutadza. Funga zvakatevedzana kana musanganiswa wakafanana kuti usangane nevoltage kana capacitance zvinodiwa uku uchichengetedza chega chega kushushikana mukati memiganho yakachengeteka.

MLCC Zvishandiso muPCB Dhizaini

Power Supply Decoupling

Kuiswa kweMLCC pedyo neIC power pins kunopa nzira dzemagetsi dzisina kupindirana (low-impedance current paths) dzekukurumidza kuchinja, zvichidzivirira kudonha kwemagetsi kunokonzera zvikanganiso zvelogic kana ruzha rweanalog. Ma capacitor akawanda ari pamwe chete anogadzira kupatsanurwa kwe broad-spectrum, ne ma values ​​madiki achibata ma frequency akakwira uye ma values ​​makuru achibata zvinodiwa zve low-frequency. Kupatsanurwa kwakakodzera kunoshandisa ceramic capacitors kuti vape mhinduro yavo nekukurumidza uye ESL yakadzikira.

High-Frequency Sefa

Signal conditioning uye EMI kudzvinyirirwa kunovimba neMLCC capacitance yekuvharira ma frequency asingadiwe pasi. Kusefa kunobudirira kunoda kunzwisisa tarisiro yema frequency range uye kusarudza MLCC ine yakakodzera self-resonant frequencies. Kuiswa kwehungwaru padhuze nezvinounzwa ruzha kana zvinopinza zvine hunyoro zvinowedzera kushanda zvakanaka kwekusefa uku uchideredza nzvimbo dzemalupu dzinogona kupenya kana kuvhiringika kwevaviri.

Kubatanidza uye DC Kuvharira

AC coupling applications inoshandisa MLCC kupfuudza masign frequency uku ichivharira maDC, akakosha muodhiyo, RF, uye maseketi ekutaurirana. Iyo isiri-polarized hunhu hweceramic capacitors inobvumira bidirectional kushanda pasina hanya nepolar panguva yenguva pfupi. Coupling capacitor kukosha inosarudza yakaderera-frequency cutoff, inoda kuverengera kuverengera kwechiratidzo chekuvimbika.

High-Speed ​​PCB Kufunga

Madhizaini epamberi anoda kutariswa kune MLCC parasitic zvinhu, yekuisa zano, uye yekudzoka nzira optimization. Deredzai kureba kwekutsvaga pakati peMLCC uye chinangwa chekushandisa kuderedza loop inductance, uye ive nechokwadi chekuti ndege dzepasi dzakasimba dzinopa nzira dzekudzoka dzakaderera. Kuburikidza nekuiswa kunobata ESL zvakanyanya; shandisa akawanda vias kana via-mu-pad tekinoroji kune yakaderera impedance yekubatanidza mune zvakakosha maapplication.

MLCC Zvakajairwa Nyaya uye Kukundikana Modes

Kukundikana Mechanisms

Kukundikana kweMLCC kunoratidza semaseketi akavhurika, maseketi mapfupi, kana kuderera kunowedzera. Kutsemuka kubva kumagetsi kushushikana kunomiririra yakajairika kutadza modhi, kazhinji inokonzerwa nebhodhi flexure panguva yekuungana kana kushanda. Thermal shock panguva yekutengesa, yakawandisa voltage kushushikana, uye dielectric kuparara kubva mukusvibiswa kana hurema hwekugadzira zvinokonzeresa mamwe maitiro ekutadza.

Mudzi Chikonzero Kuongorora

Mechanical stress kubva ku coefficient of thermal expansion (CTE) mismatch pakati peMLCC, solder, uye PCB inogadzira mukati memukati panguva yekushisa bhasikoro. Flexure panguva yekudhirowa kana yekubatanidza kuisa inoparadzira aya makatsemuka, pakupedzisira ichigadzira maseketi akavhurika. Voltage transients inodarika zvakatemerwa zvinomhanyisa kuchembera kwedielectric, nepo hunyoro huchipinda kuburikidza nekumisikidzwa kunokonzeresa kuderera kwekuita zvishoma nezvishoma.

Kudzivirira Mazano

Shandisa nzira dzakakodzera dzePCB dzekugadzirisa dzinosanganisira kucheka kwekurerutsa pedyo nezvikamu zvakakura uye kudzivirira kuiswa kweMLCC munzvimbo dzinonyanya kunetseka. Dzora reflow profiles kuti uderedze kuvhunduka kwekushisa, uye tsanangura MLCC ine flexible terminations yekuvandudza kusimba kwemichina. Isa yakakwana voltage derating uye surge dziviriro kudzivirira kuwandisa kwemagetsi panguva yekushanda.

Ramangwana Trends muMLCC Technology

Miniaturization uye Kubatanidzwa

MLCC kurongedza inoramba ichidzika yakananga ku008004 (0.25mm × 0.125mm) kune ekupedzisira-compact application, uku ichichengetedza kana kuwedzera capacitance kuburikidza nepamusoro dielectric maumbirwo. Izvi zviitiko zvinogonesa yakakwirira chikamu density muma smartphones, zvinopfeka, uye IoT zvishandiso. Nekudaro, yakanyanyisa miniaturization inodenha maitiro egungano uye inowedzera mechanic kusagadzikana kushushikana.

High-Capacitance High-Voltage Solutions

Kuiswa kwemagetsi emotokari uye kushandiswa kwesimba remagetsi kunofambisa kuvandudzwa kweMLCC inokwanisa mazana emamicrofarad pa kilovolt ratings. Zvitsva zve dielectric zvinhu uye maitiro ekugadzira anosundira miganhu yesimba density uchichengetedza kuvimbika. Uku kufambira mberi zvishoma nezvishoma kunotsiva firimu uye electrolytic capacitors mumagetsi emagetsi maapplication.

Kuvimbika uye Zvemotokari-Giredhi Zvinodiwa

Zvishandiso zveMotokari nemaindasitiri zvinoda MLCC ine vimbiso yekushanda mukati metembiricha yakanyanyisa uye hupenyu hwakawedzerwa. Vagadziri vanogadzira mota-inokwanisa MLCC musangano AEC-Q200 zviyero zvine yakakwidziridzwa kuyedzwa uye kuteedzera. Zvishandiso zvakavandudzwa uye maitirwo zvinopa maitiro ekutadza anofungidzira uye yakakwirira yenguva pakati pekutadza kwemishini-yakakosha masisitimu.

mhedziso

Kunzwisisa MLCC Maitiro mune Chaiyo Dhizaini

Imwe yeanowanzo kukonzeresa kutsauka kwekuita kunobva kuDC bias effect. Kirasi II dielectrics senge X7R neX5R inogona kurasikirwa ne50-70% yeyakayerwa capacitance pasi pemagetsi ekushanda, zvichiita kuti decoupling kana simba-kuchengetedza kushanda kupere. Mukuita, Kirasi II capacitors inoda kanenge 2 × capacitance margin, nepo masekete anoda kugadzikana anoshumirwa zviri nani neC0G/NP0 marudzi.

Mechanical Kuvimbika Kunoramba Kuine Chinetso Chikuru

Mechanical cracking inoramba iri yakajairika yekutadza modhi, kazhinji inokonzereswa nePCB kuchinjika, kudzvanywa kwegungano, kana kuiswa kwakashata. Mahombe eMLCC akaiswa padyo nemicheto yebhodhi, makomba anokwirisa, kana dzimwe nzvimbo dzinonetsekana zvakanyanya ndidzo dziri panjodzi. Madhizaini anovimbika anodzivirira kuisa yakakosha capacitor munzvimbo dzekushushikana uye funga kunochinjika kumisa kwezvishandiso uko kunotarisirwa kuomerwa.

Bancing Theory uye Practical Constraints

Kubudirira MLCC kubatanidzwa kunoenderana nekunzwisisa zvese zvenyama fizikisi uye chaiyo-yenyika zvisingakwanisi. Kudzikira kwakaringana, kurongeka kwakaringana, manejimendi ekudzvinyirira, uye kusarudzwa kwedielectric kwakakosha kuti uve nechokwadi chekuvimbika kwenguva refu uye kushanda kwemagetsi kunoenderana.

Mibvunzo Inonyanya Kubvunzwa

MLCC Inosiyana Sei neElectrolytic Capacitors?

MLCC inopa yepamusoro frequency mhinduro, yakaderera ESR, bidirectional oparesheni, uye hupenyu hurefu kana ichienzaniswa ne electrolytic capacitors, ichiita kuti ive inofarirwa nepamusoro-frequency decoupling uye kusefa. Mhando dzeElectrolytic dzinopa yakakwira capacitance pavhoriyamu uye mutengo wakanakira kune yakawanda simba rekuchengetedza maapplication. Zvido zvedunhu zvinosarudza yakakodzera tekinoroji kusarudzwa kwakavakirwa pane zvekutanga kuita.

Maitiro ekugadzirisa DC Bias Capacitance Reduction?

Sarudza MLCC ine yekutanga capacitance yakakwira zvakanyanya pane inodiwa, kazhinji 1.5-2 × yeX7R dielectrics pa50% yakayerwa voltage. Neimwe nzira, shandisa C0G/NP0 mhando dzezvikumbiro zvinoda yakagadzikana capacitance zvisinei nevoltiji, kunyangwe iri yakaderera capacitance density. Parallel musanganiswa weakawanda madiki-value capacitors anogona zvakare kudzikisira DC bias mhedzisiro uku uchivandudza kuita kwese.

Chii chinosarudza Yakakwana MLCC Layout muYakakwira-Frequency Circuits?

Deredza loop inductance nekuisa MLCC nekukasira padhuze neIC simba mapini ane hurefu hupfupi hunobvira hwekutevera. Shandisa akawanda vias kana via-mu-pad kuvaka kudzikisa yekubatanidza inductance kune pasi ndege. Govera akawanda capacitor kukosha kuti uvhare akasiyana frequency renji, uye ita shuwa nzira dzekudzoka dzazvino dzinoramba dziri padyo nechiratidzo chechiratidzo chekudzora impedance.

Chii chinonzi Typical MLCC Service Life?

Yakanyatso kucheneswa MLCC munzvimbo dzakadzorwa inoratidza hupenyu husina muganho hwemagetsi, nekuvimbika kunotangwa zvakanyanya nekushushikana kwemagetsi uye zvakatipoteredza. Voltage-tembiricha kushushikana inomhanyisa kuchembera kwedielectric mune yakakwira-K zvinhu, asi kuchengetedza kuderera kusvika 50% yakayerwa voltage inovimbisa makumi emakore ekushanda kwakavimbika. Automotive-giredhi MLCC zvinotsanangurwa zvinovimbisa hushoma hwehupenyu hunodarika makore gumi nemashanu pasi pemamiriro akatarwa.