Kev sib raug zoo ntawm kab dav dav thiab tam sim no hauv PCB tsim

Qhov no yog ib qho teeb meem uas tau ua rau ntau tus neeg mob taub hau. Kuv pom qee cov ntaub ntawv los ntawm Is Taws Nem thiab txheeb nws raws li hauv qab no. Peb yuav tsum paub tias cov tuab ntawm cov ntawv ci tooj liab yog 0.5oz (li 18μm), 1oz (li 35μm), 2oz (li 70μm) tooj liab, 3oz (li 105μm) thiab siab dua.

1. Cov ntawv hauv online

Tus nqi load-bearing muaj npe nyob rau hauv cov ntaub ntawv cov ntaub ntawv yog qhov siab tshaj plaws tam sim no load-bearing tus nqi ntawm ib txwm kub ntawm 25 degrees. Yog li ntawd, ntau yam xws li ntau yam ib puag ncig, kev tsim cov txheej txheem, cov txheej txheem phaj, thiab cov phaj zoo yuav tsum tau txiav txim siab hauv qhov tsim tiag tiag. Yog li ntawd, lub rooj tsuas yog muab raws li tus nqi siv.

2. Lub peev xwm nqa tam sim no ntawm tooj liab ntawv ntawm txawv thickness thiab dav yog qhia nyob rau hauv cov lus hauv qab no:

Nco tseg: Thaum siv tooj liab los ua tus neeg xyuas pib kom dhau qhov tam sim no loj, lub peev xwm nqa tam sim no ntawm cov ntawv ci tooj liab dav yuav tsum tau derated los ntawm 50% nrog rau cov nqi hauv lub rooj rau kev xaiv xaiv.

3. Kev sib raug zoo ntawm cov ntawv ci tooj liab thickness, kab dav thiab tam sim no hauv PCB tsim

Yuav tsum paub dab tsi yog hu ua kub nce: cov cua kub tam sim no yog tsim tom qab tus neeg xyuas pib ntws. Raws li lub sijhawm dhau mus, qhov kub ntawm tus neeg xyuas pib qhov chaw tseem nce mus txog thaum nws stabilizes. Qhov chaw ruaj khov yog qhov sib txawv ntawm qhov kub thiab txias ua ntej thiab tom qab li ntawm 3 teev tsis pub tshaj 2 ° C. Lub sijhawm no, ntsuas kub ntawm tus neeg xyuas pib saum npoo yog qhov ntsuas kub kawg ntawm tus neeg xyuas pib, thiab chav ntsuas kub yog degree (° C). Ib feem ntawm qhov kub nce siab tshaj qhov kub ntawm cov huab cua ib puag ncig (ambient kub) yog hu ua kub nce, thiab chav ntsuas kub nce yog Kelvin (K). Hauv qee cov ntawv thiab cov ntawv xeem thiab cov lus nug txog qhov kub thiab txias, chav ntsuas kub nce feem ntau yog sau ua (℃), thiab nws tsis tsim nyog siv degrees (℃) los qhia qhov kub nce.

PCB substrates feem ntau siv yog FR-4 cov ntaub ntawv. Lub zog adhesion thiab ua haujlwm kub ntawm cov ntawv ci tooj liab yog qhov siab. Feem ntau, qhov ntsuas kub ntawm PCB yog 260 ℃, tab sis qhov tseeb ntawm PCB yuav tsum tsis txhob siab tshaj 150 ℃, vim tias yog tias nws siab tshaj qhov ntsuas kub, nws yog ze heev rau lub melting point ntawm solder (183 ° C). Nyob rau tib lub sijhawm, qhov tso cai rau qhov ntsuas kub ntawm cov khoom hauv lub nkoj yuav tsum tau muab rau hauv kev txiav txim siab. Feem ntau, cov qib ICs tuaj yeem tiv taus qhov siab tshaj plaws ntawm 70 ° C, qib ICs yog 85 ° C, thiab cov tub rog-qib ICs tuaj yeem tiv taus qhov siab tshaj plaws ntawm 125 ° C. Yog li ntawd, qhov kub ntawm cov ntawv ci tooj liab nyob ze ntawm IC ntawm PCB nrog cov neeg pej xeem ICs yuav tsum tau tswj kom qis dua. Tsuas yog cov khoom siv hluav taws xob siab uas muaj qhov kub siab dua (125 ℃ ~ 175 ℃) tuaj yeem tso cai kom siab dua. PCB kub, tab sis cov nyhuv ntawm PCB siab kub ntawm lub tshav kub dissipation ntawm lub hwj chim pab kiag li lawm yuav tsum tau xav txog.