Kubatana kwemagetsi pakati pezvikamu paPCBA kunowanikwa kuburikidza nemhangura foil wiring uye kuburikidza-maburi pane imwe neimwe layer.
Kubatana kwemagetsi pakati pezvikamu paPCBA kunowanikwa kuburikidza nemhangura foil wiring uye kuburikidza-maburi pane imwe neimwe layer. Nekuda kwezvigadzirwa zvakasiyana, mamodule akasiyana ehukuru hwakasiyana hwazvino, kuti vakwanise kuita basa rega rega, vagadziri vanofanirwa kuziva kana iyo yakagadzirwa wiring uye kuburikidza negomba inogona kutakura inowirirana ikozvino, kuitira kuti iwane basa rechigadzirwa, kudzivirira chigadzirwa. kubva pakutsva kana overcurrent.
Pano inosuma dhizaini uye bvunzo yeazvino kutakura kugona kwewaya uye maburi ekupfuura paFR4 copper-yakavharwa ndiro uye mhinduro dzebvunzo. Mhedzisiro yemuyedzo inogona kupa imwe referensi yevagadziri mune ramangwana dhizaini, zvichiita kuti PCB dhizaini iwedzere kunzwisisika uye zvakanyanya kuenderana nezvinodiwa zvazvino.
Kubatana kwemagetsi pakati pezvikamu paPCBA kunowanikwa kuburikidza nemhangura foil wiring uye kuburikidza-maburi pane imwe neimwe layer.
Kubatana kwemagetsi pakati pezvikamu paPCBA kunowanikwa kuburikidza nemhangura foil wiring uye kuburikidza-maburi pane imwe neimwe layer. Nekuda kwezvigadzirwa zvakasiyana, mamodule akasiyana ehukuru hwakasiyana hwazvino, kuti vakwanise kuita basa rega rega, vagadziri vanofanirwa kuziva kana iyo yakagadzirwa wiring uye kuburikidza negomba inogona kutakura inowirirana ikozvino, kuitira kuti iwane basa rechigadzirwa, kudzivirira chigadzirwa. kubva pakutsva kana overcurrent.
Pano inosuma dhizaini uye bvunzo yeazvino kutakura kugona kwewaya uye maburi ekupfuura paFR4 copper-yakavharwa ndiro uye mhinduro dzebvunzo. Mhedzisiro yemuyedzo inogona kupa imwe referensi yevagadziri mune ramangwana dhizaini, zvichiita kuti PCB dhizaini iwedzere kunzwisisika uye zvakanyanya kuenderana nezvinodiwa zvazvino.
Padanho razvino, chinhu chikuru cheakadhindwa redunhu bhodhi (PCB) ndiro yemhangura yakavharwa ndiro yeFR4. Iyo foil yemhangura ine kuchena kwemhangura isingasviki 99.8% inoziva kubatana kwemagetsi pakati pechikamu chimwe nechimwe mundege, uye iyo kuburikidza neburi (VIA) inoziva kubatana kwemagetsi pakati pefoiri yemhangura ine chiratidzo chimwe chete panzvimbo.
Asi kune maitiro ekugadzira hupamhi hwemhangura foil, nzira yekutsanangura iyo aperture yeVIA, isu tinogara tichigadzira neruzivo.
Kuti uite kuti dhizaini iwedzere kunzwisisika uye isangane nezvinodiwa, ikozvino kutakura kugona kwemhangura foil ine akasiyana waya madhayamita inoedzwa, uye mhinduro dzebvunzo dzinoshandiswa sereferensi yekugadzira.
Ongororo yezvinhu zvinokanganisa kugona kutakura ikozvino
Saizi yazvino yePCBA inosiyana neye module basa rechigadzirwa, saka isu tinofanirwa kufunga kuti wiring inoshanda sebhiriji inogona kutakura ikozvino kupfuura. Zvinhu zvikuru zvinotaridza huwandu hwazvino hwekutakura ndezvi:
Copper foil ukobvu, waya upamhi, tembiricha kukwira, plating kuburikidza negomba aperture. Mumagadzirirwo chaiwo, isu tinofanirawo kufunga nezvezvakatipoteredza zvechigadzirwa, tekinoroji yekugadzira PCB, kunaka kweplate uye zvichingodaro.
1.Copper foil ukobvu
Pakutanga kwekugadzirwa kwechigadzirwa, mhangura foil ukobvu hwePCB hunotsanangurwa zvinoenderana nemutengo wechigadzirwa uye chimiro chazvino pane chigadzirwa.
Kazhinji, kune zvigadzirwa zvisina yakakwirira ikozvino, unogona kusarudza pamusoro (yemukati) layer yemhangura foil inenge 17.5μm ukobvu:
Kana chigadzirwa chacho chine chikamu chepamusoro-soro, saizi yeplate yakakwana, unogona kusarudza nzvimbo (yemukati) dhizaini ye35μm ukobvu hwemhangura foil;
Kana mazhinji ezviratidzo ari muchigadzirwa akakwira ikozvino, iyo yemukati yemhangura foil inenge 70μm gobvu inofanira kusarudzwa.
KuPCB ine zvidimbu zvinopfuura zviviri, kana pasi uye mukati memhangura foil inoshandisa ukobvu hwakafanana uye dhayamita yewaya imwe chete, kutakura ikozvino kwepamusoro kwepamusoro kwakakura kudarika kwemukati.
Tora kushandiswa kwe 35μm yemhangura foil yemukati nekunze zvidimbu zvePCB semuenzaniso: dunhu remukati rine laminated mushure mekucheka, saka ukobvu hwemukati memhangura foil ndeye 35μm.
Mushure me etching yedunhu rekunze, zvinodikanwa kuchera makomba. Nekuti maburi mushure mekuchera haana magetsi ekubatanidza kuita, zvinodikanwa kuti electroless copper plating, inova ndiro yese copper plating process, saka iyo yekumusoro foil yemhangura ichaputirwa nehumwe gobvu remhangura, kazhinji pakati pe25μm ne35μm, saka ukobvu chaihwo hwekunze hwendarira foil hunenge 52.5μm kusvika 70μm.
Kufanana kwefoiri yemhangura kunosiyana nekugona kwevanopa ndiro yemhangura, asi mutsauko hauna kukosha, saka pesvedzero pamutoro wazvino inogona kufuratirwa.
2.Wire line
Mushure memhangura foil ukobvu hwasarudzwa, hupamhi hwemutsara hunova fekitori inogadzirisa yezvino kutakura kugona.
Pane kumwe kutsauka pakati peyakagadzirirwa kukosha kwehupamhi hwemutsara uye kukosha chaiko mushure mekucheka. Kazhinji, kutsauka kunobvumirwa ndiko +10μm/-60μm. Nekuda kwekuti wiring yakamiswa, pachave nekusara kwemvura mukona yewaya, saka kona yewaya inowanzova iyo isina kusimba nzvimbo.
Nenzira iyi, kana uchiverenga kukosha kwekuremerwa kwemutsara nekona, kukosha kwekuyerwa kwezvino kuyerwa pamutsetse wakatwasuka kunofanira kuwanzwa ne (W-0.06) /W (W ndiyo upamhi hwemutsara, chikwata chiri mm).
3.Temperature inokwira
Kana tembiricha ichikwira kusvika kana kukwira kupfuura tembiricha yeTG ye substrate, inogona kukonzera deformation ye substrate, senge warping uye kubhuroka, kuitira kukanganisa simba rekusunga pakati pefoiri yemhangura uye substrate. Iyo warping deformation ye substrate inogona kutungamirira mukuputsika.
Mushure mekunge PCB wiring yapfuura iyo inofamba yakakura ikozvino, iyo isina kusimba nzvimbo yemhangura foil wiring haigone kupisa kune zvakatipoteredza kwenguva pfupi, inoswedera kune adiabatic system, tembiricha inokwira zvakanyanya, inosvika pakunyunguduka kwemhangura, uye waya yemhangura inopiswa. .
4.Kuputira kuburikidza negomba aperture
Electroplating kuburikidza nemakomba inogona kuona kubatanidzwa kwemagetsi pakati pezvikamu zvakasiyana ne electroplating mhangura pamadziro egomba. Sezvo iri copper plating yeplate yese, ukobvu hwemhangura hwegomba remadziro hwakafanana kune akaputirwa nemaburi ega ega. Ikozvino-yekutakura kugona kweakaputirwa nemakomba ane akasiyana pore saizi zvinoenderana neperimeter yemhangura madziro.