Ifomula Yomthamo Ekwakhiweni Kwe-PCB

Umthamo uthinta isitoreji samandla, ukuhlunga, isikhathi, ukuxhuma, kanye nobuqotho bamandla kuwo wonke umkhiqizo we-elekthronikhi. Ekwakhiweni kwe-PCB, ifomula eyisisekelo iyindawo yokuqala kuphela: ukuziphatha kwangempela kuncike ekubandlululeni kwamandla kagesi, ukubekezelelana, i-ESR, i-ESL, ukubekwa, kanye nokungapheleli okudalwe yisakhiwo.

Lesi sihloko sixhumanisa ifomula yomthamo nezinqumo ezisebenzayo ekukhetheni izingxenye kanye nokuhlanganiswa kwe-PCB.

Okuqukethwe

• Ifomula Yomthamo
• Ukuziphatha Kwangempela Kwe-Capacitor
• Ukuhlukanisa kanye Nobuqotho Bamandla
• Umthamo we-PCB Parasitic
• Ukukhethwa Kwezingxenye Nokuhlanganiswa
• Ukubuyekezwa Komklamo Nge-Highleap Electronics

Ifomula Yomthamo

I-Capacitance ichazwa ngokuthi C = Q / V , lapho u-C eyi-capacitance, u-Q eyi-charge egciniwe, kanti u-V uyi-voltage. Ukuze kube nesakhiwo se-parallel-plate esifanele, i-capacitance ilinganiselwa ku- C = epsilon A / d : i-permittivity ephindaphindwe ngendawo ye-plate futhi ihlukaniswe ngebanga lokuhlukaniswa.

The ideal capacitance equation does not capture every operating effect of a real part. In ukukhetha kwe-capacitor, check the approved device data for voltage, temperature, parasitics, package and the function the capacitor performs in the circuit.

Lobu budlelwano buchaza ukuthi kungani izakhiwo ze-dielectric, i-conductor geometry, kanye nesikhala kubalulekile kuzo zombili izingxenye kanye nezakhiwo ze-PCB. Azibikezeli, zodwa, ukuziphatha kwemvamisa ephezulu ye-capacitor efakiwe.

Ukuziphatha Kwangempela Kwe-Capacitor

I-capacitor yangempela ihlanganisa ukumelana ne-parasitic kanye ne-inductance. Njengoba imvamisa ikhula, lawo ma-parasitic angabusa futhi adale iphuzu eliziphendulelayo ngaphezu kwalokho ingxenye engasasebenzi njengesici esifanelekile se-capacitive.

Buyekeza idatha yengxenye ukuze uthole ukubekezelelana kwe-capacitance, ukuziphatha kwe-DC-bias, izici zokushisa, i-ESR, kanye nama-impedance curves. Lokhu kubaluleke kakhulu uma ama-MLCC esetshenziswa eduze kwe-voltage yawo ekalwe noma ezisetshenzisweni zokushisa okubanzi.

Ukuhlukanisa kanye Nobuqotho Bamandla

Ama-capacitor ahlukanisayo ahlinzeka ngokuqhuma okufushane komsinga eduze kwe-IC futhi anciphisa ukunyakaza kwe-voltage ku-power rail. Ukusebenza kwawo kuthinteka kakhulu yi-loop eyakhiwe yi-capacitor, iphini likagesi, ukubuya komhlabathi, kanye nama-via.

• Beka ama-decouplers amancane kakhulu anemvamisa ephezulu eduze kwezikhonkwane zamandla ezifanele.
• Sebenzisa ukuxhumana okufushane, okubanzi kanye ne-reference plane eqhubekayo lapho kungenzeka khona.
• Khetha amanani e-capacitance kusukela esiqondisweni se-IC kanye nephrofayili yokufunwa kwamandla okulinganisiwe noma okulingisiwe.

Umthamo we-PCB Parasitic

Izici zethusi eziseduze nazo zakha amandla. Ama-plane pair, ama-trace phezu kwama-reference planes, ama-pad, kanye nezakhiwo zokuxhuma kungathinta imiphetho yesiginali, ukuxhumanisa, kanye ne-impedance. Emiklamo ye-controlled-impedance, idatha ye-stack-up kanye nokubala kwe-field-solver kuthembeke kakhulu kunemithetho yesithupha.

Gcina amanetha azwelayo ehlukaniswe nama-node okushintshana anomsindo, futhi ulondoloze indlela ecacile yokubuya ukuze izimuncagazi ezingenakugwenywa zingadali ukuhlangana komsindo okungalindelekile.

Ukukhethwa Kwezingxenye Nokuhlanganiswa

Khetha amaphakheji e-capacitor kanye nezinhlobo ze-dielectric kusukela ku-voltage yokusebenza, ububanzi bemvamisa, izinga lokushisa, ukuzinza okudingekayo, kanye nemikhawulo yokuhlanganisa. Amaphakheji amancane kakhulu anciphisa i-inductance yokufaka kodwa angaba bucayi kakhulu ekuqhekekeni kwe-flex uma ibhodi noma inqubo yokususa amapaneli ingalawulwa.

Amaphethini omhlaba, izimbobo zokunamathisela i-solder, iphrofayili yokugeleza kabusha, kanye nokusekelwa kwebhodi kufanele kubuyekezwe ndawonye ukuze kuhlanganiswe ngendlela ethembekile.

Ukubuyekezwa Komklamo Nge-Highleap Electronics

I-Highleap Electronics ingabuyekeza amaphethini omhlaba we-capacitor, imikhawulo yokubekwa, ulwazi lokuhlanganisa, kanye nezidingo zokuhlanganisa ngaphambi kokukhiqiza. Ukunikeza ama-power rails abalulekile kanye nanoma yiziphi izidingo ze-impedance kwenza ukubuyekezwa kugxile kakhulu.

Ukuze uthole isibuyekezo sokwenziwa, cela ikhotheshini ye-PCB enamafayela e-Gerber, i-BOM, kanye namanothi okuklama afanele.