Buyini ubudlelwano phakathi kwezintambo ze-PCB, ngembobo namandla okuthwala amanje?

Ukuxhumana kukagesi phakathi kwezingxenye ku-PCBA kufinyelelwa ngocingo lwe-foil yethusi kanye nezimbobo kusendlalelo ngasinye.

Ukuxhumana kukagesi phakathi kwezingxenye ku-PCBA kufinyelelwa ngocingo lwe-foil yethusi kanye nezimbobo kusendlalelo ngasinye.Ngenxa yemikhiqizo ehlukene, amamojula ahlukene anosayizi ohlukile wamanje, ukuze kuzuzwe umsebenzi ngamunye, abaklami kudingeka bazi ukuthi izintambo eziklanyelwe futhi ngokusebenzisa imbobo zingathwala okwamanje okuhambisanayo, ukuze kuzuzwe umsebenzi womkhiqizo, kuvimbele umkhiqizo. kusuka ekushiseni lapho i-overcurrent.

Lapha kwethulwa idizayini nokuhlolwa komthamo wamanje wokuthwala wezintambo nezimbobo ezidlulayo kupuleti elinekhopha elingu-FR4 kanye nemiphumela yokuhlolwa.Imiphumela yokuhlolwa inganikeza ireferensi ethile kubaklami ekwakhiweni kwesikhathi esizayo, okwenza idizayini ye-PCB ibe nengqondo futhi ihambisane kakhulu nezidingo zamanje.

Ukuxhumana kukagesi phakathi kwezingxenye ku-PCBA kufinyelelwa ngocingo lwe-foil yethusi kanye nezimbobo kusendlalelo ngasinye.

Okwamanje, into esemqoka yebhodi lesekethe ephrintiwe (PCB) ipuleti elenziwe ngethusi elingu-FR4.I-foil yethusi enobumsulwa bethusi obungekho ngaphansi kuka-99.8% ibona ukuxhumana kukagesi phakathi kwengxenye ngayinye endizeni, futhi imbobo yokudlula (VIA) ibona ukuxhumana kukagesi phakathi kwecwecwe lethusi elinesiginali efanayo esikhaleni.

Kodwa indlela yokuklama ububanzi be-foil yethusi, indlela yokuchaza i-aperture ye-VIA, sihlala siklama ngolwazi.

Ukuze kwenziwe idizayini yesakhiwo ibe nengqondo kakhudlwana futhi ihlangabezane nezidingo, umthamo wamanje wokuthwala we-foil yethusi enobubanzi bezintambo obuhlukene uyahlolwa, futhi imiphumela yokuhlolwa isetshenziswa njengereferensi yokuklama.

Ukuhlaziywa kwezinto ezithinta umthamo wamanje wokuthwala

Usayizi wamanje we-PCBA uyahlukahluka ngomsebenzi wemojula yomkhiqizo, ngakho-ke sidinga ukucabangela ukuthi izintambo ezisebenza njengebhuloho zingathwala yini ukudlula kwamanje.Izinto eziyinhloko ezinquma umthamo wamanje wokuthwala yizi:

Ukuqina kwe-foil yethusi, ububanzi bentambo, ukukhuphuka kwezinga lokushisa, ukucwenga ngembobo yembobo.Ekwakhiweni kwangempela, kudingeka futhi sicabangele indawo yomkhiqizo, ubuchwepheshe bokukhiqiza be-PCB, ikhwalithi yamapuleti nokunye.

1.I-Copper foil ukujiya

Ekuqaleni kokuthuthukiswa komkhiqizo, ukujiya kwe-copper foil ye-PCB kuchazwa ngokwezindleko zomkhiqizo kanye nesimo samanje somkhiqizo.

Ngokuvamile, emikhiqizweni engenawo amandla amanje aphezulu, ungakhetha ungqimba olungaphezulu ( lwangaphakathi) lwe-copper foil cishe ngo-17.5μm ukujiya:

Uma umkhiqizo unengxenye yamanje ephezulu, usayizi wepuleti wanele, ungakhetha ungqimba olungaphezulu ( lwangaphakathi) olungaba ngu-35μm ubukhulu be-foil yethusi;

Uma amasignali amaningi emkhiqizweni angamanje aphezulu, ungqimba lwangaphakathi lwe-copper foil cishe ngo-70μm obukhulu kufanele lukhethwe.

Ku-PCB enezendlalelo ezingaphezu kwezimbili, uma icwecwe lethusi nelangaphakathi lisebenzisa ukujiya okufanayo kanye nobubanzi bocingo obufanayo, umthamo wamanje wokuthwala wengqimba yangaphezulu mkhulu kunalowo wengqimba yangaphakathi.

Thatha ukusetshenziswa kwe-foil yethusi engu-35μm kuzo zombili izingqimba zangaphakathi nezangaphandle ze-PCB njengesibonelo: isifunda sangaphakathi senziwe nge-laminated ngemva kokusikwa, ngakho ukushuba kwecwecwe lethusi elingaphakathi lingu-35μm.

Ngemuva kokukhishwa kwesifunda sangaphandle, kuyadingeka ukubhoboza izimbobo.Ngenxa yokuthi izimbobo emva kokubhoboza azinawo ukusebenza kokuxhumana kagesi, kuyadingeka ukuthi kufakwe ithusi elingenawo ugesi, okuyinqubo yonke yokucwenga ipuleti yethusi, ngakho ucwecwe lwethusi olungaphezulu luzobe lumbozwe ukushuba okuthile kwethusi, ngokuvamile phakathi kuka-25μm no-35μm, ngakho ukujiya kwangempela kwecwecwe lethusi langaphandle lingaba ngu-52.5μm kuya ku-70μm.

Ukufana kwe-foil yethusi kuyahlukahluka ngamandla wabahlinzeki bepuleti le-copper, kodwa umehluko awubalulekile, ngakho-ke umthelela emthwalweni wamanje unganakwa.

2.Intambo yocingo

Ngemva kokukhethwa kokuqina kwe-foil yethusi, ububanzi bomugqa buba imboni enqumayo yomthamo wamanje wokuthwala.

Kukhona ukuchezuka okuthile phakathi kwevelu eklanyelwe yobubanzi bomugqa kanye nenani langempela ngemva kokubhala.Ngokuvamile, ukuchezuka okuvumelekile kungu-+10μm/-60μm.Ngenxa yokuthi i-wiring ibhaliwe, kuzoba khona izinsalela eziwuketshezi ekhoneni lezintambo, ngakho-ke ikhona lezintambo ngokuvamile lizoba yindawo ebuthakathaka kakhulu.

Ngale ndlela, lapho ubala inani lamanje lomthwalo womugqa onekhoneni, inani lamanje lomthwalo elilinganiswa emugqeni oqondile kufanele liphindwe (W-0.06) /W (W ububanzi bomugqa, iyunithi mm).

3.Izinga lokushisa liyakhuphuka

Lapho izinga lokushisa likhuphuka lifinyelela noma liphakeme kunezinga lokushisa le-TG le-substrate, lingase libangele ukuwohloka kwe-substrate, njengokungqubuzana nokugwedla, ukuze kuthinte amandla okubopha phakathi kwecwecwe lethusi ne-substrate.Ukuguqulwa kwe-warping ye-substrate kungase kuholele ekuqhekekeni.

Ngemuva kokuthi izintambo ze-PCB zidlule i-current enkulu edlulayo, indawo ebuthaka kakhulu ye-copper foil wiring ayikwazi ukushisa emvelweni isikhathi esifushane, isondele ohlelweni lwe-adiabatic, izinga lokushisa likhuphuka kakhulu, lifinyelele endaweni yokuncibilika yethusi, futhi ucingo lwethusi luyashiswa. .

4.Ukucwenga ngokuvula imbobo

I-Electroplating ngokusebenzisa izimbobo ingabona ukuxhumana kukagesi phakathi kwezingqimba ezihlukene ngokufaka ithusi nge-electroplating odongeni lwembobo.Njengoba kuyi-copper plating yayo yonke ipuleti, ukujiya kwethusi kodonga lwembobo kuyafana kokugqitshwe ngezimbobo zembobo ngayinye.Umthamo wamanje wokuthwala wokugqitshwa ngezimbobo ezinosayizi abahlukahlukene wezimbotshana uncike kupherimitha yodonga lwethusi