Ubudlelwano phakathi kobubanzi bokulandelela kanye nokungaphakathi kwamanje PCB design

Le yinkinga edala ukuthi abantu abaningi baphathwe yikhanda. Ngithole ulwazi oluthile ku-inthanethi futhi ngaluhlela ngendlela elandelayo. Kudingeka sazi ukuthi ukujiya kwefoyili yethusi kungu-0.5oz (cishe u-18μm), u-1oz (cishe u-35μm), u-2oz (cishe u-70μm) wethusi, u-3oz (cishe u-105μm) nangaphezulu.

1. Amafomu aku-inthanethi

Inani elithwala umthwalo elisohlwini lwedatha yethebula inani eliphezulu lamanje elithwala umthwalo ezingeni lokushisa elivamile lama-degree angu-25. Ngakho-ke, izici ezahlukahlukene ezifana nezindawo ezahlukahlukene, izinqubo zokukhiqiza, izinqubo zamapuleti, kanye nekhwalithi yamapuleti kufanele kubhekwe ekwakhiweni kwangempela. Ngakho-ke, ithebula linikezwa kuphela njengenani lereferensi.

2. Umthamo wamanje wokuthwala we-foil yethusi enogqinsi nobubanzi obuhlukene ukhonjiswe kuthebula elilandelayo:

Qaphela: Uma usebenzisa ithusi njenge-conductor ukuze udlule imisinga emikhulu, umthamo wamanje wokuthwala we-copper foil ububanzi kufanele wehliswe ngo-50% ngokubhekisela enanini elikuthebula ukuze kucatshangelwe ukukhetha.

3. Ubudlelwano phakathi kobukhulu be-foil yethusi, ububanzi bokulandelela kanye nokwamanje ekwakhiweni kwe-PCB

Udinga ukwazi lokho okubizwa ngokuthi ukunyuka kwezinga lokushisa: umphumela wokushisa wamanje ukhiqizwa ngemva kokuba umqhubi ugeleza. Njengoba isikhathi sihamba, izinga lokushisa le-conductor surface liyaqhubeka likhuphuka kuze kube yilapho lizinza. Isimo esizinzile ukuthi umehluko wezinga lokushisa ngaphambi nangemuva kwamahora ama-3 aweqi ku-2°C. Ngalesi sikhathi, izinga lokushisa elilinganiselwe le-conductor surface yizinga lokushisa lokugcina le-conductor, futhi iyunithi lokushisa yi-degree (°C). Ingxenye yezinga lokushisa elikhuphukayo elidlula izinga lokushisa komoya ozungezile (izinga lokushisa elizungezile) libizwa ngokuthi ukukhuphuka kwezinga lokushisa, kanti iyunithi yokukhuphuka kwezinga lokushisa ngu-Kelvin (K). Kwamanye ama-athikili nemibiko yokuhlola nemibuzo yokuhlola mayelana nokukhuphuka kwezinga lokushisa, iyunithi yokukhuphuka kwezinga lokushisa ivamise ukubhalwa ngokuthi (℃), futhi akufaneleki ukusebenzisa amadigri (℃) ukuveza ukukhuphuka kwezinga lokushisa.

Ama-substrates e-PCB avame ukusetshenziswa yizinto ze-FR-4. Amandla okunamathela kanye nezinga lokushisa lokusebenza le-foil yethusi liphakeme kakhulu. Ngokuvamile, izinga lokushisa elivumelekile le-PCB lingu-260℃, kodwa izinga lokushisa langempela le-PCB akufanele lidlule ku-150℃, ngoba uma lidlula leli zinga lokushisa Liseduze kakhulu nendawo yokuncibilika kwe-solder (183°C). Ngesikhathi esifanayo, izinga lokushisa elivumelekile lezingxenye ezisebhodini kufanele futhi licatshangelwe. Ngokuvamile, ama-IC ezinga lezempi angakwazi ukumelana nesilinganiso esiphezulu esingu-70°C, ama-IC ebanga lezimboni angu-85°C, kanti ama-IC ezinga lezempi angakwazi ukumelana nesilinganiso esiphezulu esingu-125°C. Ngakho-ke, izinga lokushisa le-foil yethusi eduze ne-IC ku-PCB enama-IC avamile kufanele lilawulwe ezingeni eliphansi. Amadivayisi anamandla aphezulu kuphela anokumelana nezinga lokushisa okuphezulu (125℃～175℃) angavunyelwa ukuba ngaphezulu. Izinga lokushisa le-PCB, kodwa umthelela wezinga lokushisa eliphezulu le-PCB ekusabalaliseni ukushisa kwamadivayisi kagesi nawo udinga ukucatshangelwa.