Taw qhia txog qhov zoo thiab qhov tsis zoo ntawmBGA PCBlub rooj tsavxwm
Lub pob kab sib chaws array (BGA) luam tawm Circuit Board (PCB) yog lub pob mount pob PCB tsim tshwj xeeb rau kev sib xyaw ua ke. BGA boards yog siv rau hauv daim ntawv thov qhov chaw mounting yog ruaj khov, piv txwv li, hauv cov khoom siv xws li microprocessors. Cov no yog cov ntawv luam tawm pov tseg thiab tsis tuaj yeem rov siv dua. BGA boards muaj kev sib txuas sib txuas ntau dua li PCBs niaj hnub. Txhua lub ntsiab lus ntawm BGA pawg thawj coj tuaj yeem ua rau nws tus kheej. Tag nrho cov kev sib txuas ntawm cov PCBs no tau nthuav tawm nyob rau hauv daim ntawv ntawm ib tug zoo matrix los yog daim phiaj saum npoo. Cov PCBs no tau tsim los kom tag nrho cov hauv qab tuaj yeem siv tau yooj yim es tsis txhob siv cov khoom siv peripheral.
Cov pins ntawm BGA pob yog luv dua li PCB li niaj zaus vim tias nws tsuas muaj ib puag ncig hom duab. Vim li no, nws muab kev ua tau zoo dua ntawm kev nrawm dua. BGA welding yuav tsum tau tswj kom meej thiab feem ntau yog coj los ntawm cov tshuab automated. Qhov no yog vim li cas cov khoom siv BGA tsis haum rau lub qhov (socket mounting).
Soldering technology BGA ntim
Lub qhov cub reflow yog siv los ua cov pob BGA rau lub rooj tsav xwm luam tawm. Thaum lub melting ntawm cov pob solder pib nyob rau hauv lub qhov cub, qhov nro ntawm cov pob molten yuav ua rau lub pob nyob rau hauv nws txoj hauj lwm tiag tiag ntawm PCB. Cov txheej txheem no txuas ntxiv mus txog thaum lub pob raug tshem tawm ntawm qhov cub, txias thiab ua kom khov. Txhawm rau kom muaj cov pob qij txha ruaj khov, cov txheej txheem tswj cov txheej txheem BGA yog qhov tsim nyog thiab yuav tsum ncav cuag qhov kub thiab txias. Thaum siv cov txheej txheem soldering kom raug, nws kuj tshem tawm qhov ua tau ntawm luv luv circuits.
Qhov zoo ntawm BGA ntim
Muaj ntau qhov zoo rau BGA ntim, tab sis tsuas yog cov lus qhia saum toj kawg nkaus tau piav qhia hauv qab no.
1. BGA ntim khoom siv PCB qhov chaw zoo: Kev siv BGA ntim cov lus qhia siv cov khoom me me thiab cov hneev taw me me. Cov pob no kuj pab txuag tau qhov chaw txaus rau kev hloov kho hauv PCB, yog li ua kom nws ua tau zoo.
2. Kev txhim kho hluav taws xob thiab thermal kev ua tau zoo: Qhov loj ntawm BGA pob khoom me me, yog li cov PCBs dissipate tsawg tshav kub thiab cov txheej txheem dissipation yog ib qho yooj yim rau kev siv. Thaum twg lub silicon wafer yog mounted rau sab saum toj, feem ntau ntawm tshav kub yog kis ncaj qha mus rau lub pob kab sib chaws. Txawm li cas los xij, nrog cov silicon tuag mounted rau hauv qab, silicon tuag txuas mus rau sab saum toj ntawm pob. Qhov no yog vim li cas nws thiaj suav hais tias yog qhov kev xaiv zoo tshaj plaws rau kev siv tshuab cua txias. Tsis muaj cov pins uas tuaj yeem kho tau lossis tsis yooj yim nyob rau hauv pob BGA, yog li lub zog ntawm cov PCBs no tau nce ntxiv thaum tseem ua kom muaj hluav taws xob zoo.
3. Txhim kho kev tsim khoom tau txais txiaj ntsig los ntawm kev txhim kho soldering: Cov ntaub qhwv ntawm BGA pob khoom loj txaus ua rau lawv yooj yim rau solder thiab yooj yim los tuav. Yog li ntawd, qhov yooj yim ntawm vuam thiab tuav ua rau nws ceev heev rau kev tsim khoom. Cov ntaub qhwv loj ntawm cov PCBs no tuaj yeem ua haujlwm yooj yim dua yog tias xav tau.
4. QHOV CHAW UA HAUJ LWM HAUJ LWM: Cov pob BGA yog cov khoom siv hauv lub xeev soldered, yog li muab lub zog ruaj khov thiab ua haujlwm ntev nyob rau txhua qhov xwm txheej.
ntawm 5. Txo cov nqi: Cov txiaj ntsig saum toj no pab txo tus nqi ntawm BGA ntim. Kev siv cov khoom siv hluav taws xob zoo tshaj plaws muab sijhawm ntxiv los txuag cov ntaub ntawv thiab txhim kho cov khoom siv hluav taws xob zoo dua qub, pab ua kom cov khoom siv hluav taws xob zoo thiab txo qhov tsis xws luag.
Disadvantages ntawm BGA ntim
Cov hauv qab no yog qee qhov tsis zoo ntawm cov pob BGA, piav qhia meej.
1. Cov txheej txheem tshuaj xyuas yog qhov nyuaj heev: Nws yog qhov nyuaj heev rau kev tshuaj xyuas lub voj voog thaum lub sij hawm cov txheej txheem ntawm soldering cov khoom mus rau BGA pob. Nws yog ib qho nyuaj heev los xyuas seb puas muaj qhov yuam kev hauv pob BGA. Tom qab txhua yam khoom raug soldered, lub pob yog nyuaj rau nyeem thiab tshuaj xyuas. Txawm hais tias muaj qhov yuam kev thaum lub sijhawm kuaj xyuas, nws yuav nyuaj rau kho. Yog li ntawd, txhawm rau txhawm rau tshuaj xyuas, siv CT scan thiab X-ray technologies kim heev.
2. Cov teeb meem kev ntseeg siab: BGA pob khoom raug kev nyuaj siab. Qhov fragility no yog vim khoov kev nyuaj siab. Qhov kev ntxhov siab khoov no ua rau muaj teeb meem kev ntseeg siab hauv cov ntawv luam tawm Circuit Board. Txawm hais tias cov teeb meem kev ntseeg tau tsawg tsawg hauv cov pob BGA, qhov ua tau yog ib txwm muaj.
BGA ntim RayPCB thev naus laus zis
Feem ntau siv tshuab rau BGA pob loj siv los ntawm RayPCB yog 0.3 hli, thiab qhov tsawg kawg nkaus uas yuav tsum nyob nruab nrab ntawm circuits yog khaws cia ntawm 0.2 hli. Qhov sib nrug tsawg kawg ntawm ob pob BGA sib txawv (yog tias khaws cia ntawm 0.2 hli). Txawm li cas los xij, yog tias qhov xav tau sib txawv, thov hu rau RAYPCB rau kev hloov pauv rau cov ntsiab lus xav tau. Qhov kev ncua deb ntawm BGA pob loj yog qhia hauv daim duab hauv qab no.
Yav tom ntej BGA ntim
Nws yog qhov tsis lees paub tias BGA ntim yuav ua rau cov khoom siv hluav taws xob thiab hluav taws xob ua lag luam yav tom ntej. Lub neej yav tom ntej ntawm BGA ntim khoom yog ruaj khov thiab nws yuav nyob hauv kev ua lag luam rau qee lub sijhawm. Txawm li cas los xij, tam sim no tus nqi ntawm kev nce qib ntawm cov thev naus laus zis tau nrawm heev, thiab nws xav tias yav tom ntej yuav muaj lwm hom ntawv luam tawm Circuit Board uas muaj txiaj ntsig zoo dua li BGA ntim. Txawm li cas los xij, kev nce qib hauv thev naus laus zis kuj tau ua rau muaj kev nce nqi thiab nqi teeb meem rau lub ntiaj teb hluav taws xob. Yog li ntawd, nws tau xav tias BGA ntim yuav mus ntev hauv kev lag luam hluav taws xob vim muaj txiaj ntsig zoo thiab ua haujlwm ntev. Tsis tas li ntawd, muaj ntau hom BGA pob khoom, thiab qhov sib txawv ntawm lawv hom ua rau qhov tseem ceeb ntawm BGA pob. Piv txwv li, yog tias qee hom BGA pob tsis haum rau cov khoom siv hluav taws xob, lwm hom BGA pob yuav raug siv.