Hauv kev tsim qauv ntawm PCB, qhov kev teeb tsa ntawm cov khoom yog qhov tseem ceeb, uas txiav txim siab qhov zoo thiab zoo nkauj ntawm lub rooj tsavxwm thiab qhov ntev thiab qhov ntau ntawm cov ntawv luam tawm, thiab muaj qee yam cuam tshuam rau kev ntseeg tau ntawm tag nrho lub tshuab.
Ib lub rooj tsavxwm zoo, ntxiv rau kev paub txog lub hauv paus ntsiab lus ntawm kev ua haujlwm, tab sis kuj yuav tsum xav txog EMI, EMC, ESD (electrostatic paug), teeb liab kev ncaj ncees thiab lwm yam khoom siv hluav taws xob, tab sis kuj tseem xav txog cov qauv siv tshuab, lub zog hluav taws xob loj. teeb meem dissipation.
General PCB layout specification yuav tsum
1, nyeem cov ntaub ntawv piav qhia tsim, ua tau raws li cov qauv tshwj xeeb, tshwj xeeb module thiab lwm yam kev xav tau.
2, teem lub layout daim phiaj taw tes rau 25mil, tuaj yeem ua raws li qhov sib npaug ntawm qhov sib npaug; Hom kev sib raug zoo yog qhov loj ua ntej me me (cov khoom siv loj thiab cov khoom siv loj ua ntej), thiab hom kev sib dhos yog qhov nruab nrab, raws li qhia hauv daim duab hauv qab no
3, ua tau raws li cheeb tsam txwv qhov siab txwv, cov qauv thiab cov cuab yeej tshwj xeeb layout, txwv cheeb tsam yuav tsum tau.
① Daim duab 1 (sab laug) hauv qab no: Qhov siab txwv qhov yuav tsum tau ua, cim kom meej hauv cov txheej txheem txheej txheem lossis txheej txheej, yooj yim rau kev kuaj xyuas tom qab;
(2) Ua ntej layout, teem lub cheeb tsam txwv tsis pub, yuav tsum tau cov cuab yeej yuav tsum tau 5 hli ntawm lub ntug ntawm lub rooj tsavxwm, tsis txhob layout lub ntaus ntawv, tshwj tsis yog tshwj xeeb yuav tsum tau los yog tom ntej no board tsim yuav ntxiv ib tug txheej txheem ntug;
③ Cov txheej txheem ntawm cov qauv thiab cov khoom siv tshwj xeeb tuaj yeem raug muab tso rau hauv kev sib koom ua ke lossis los ntawm kev sib koom ua ke ntawm cov txheej txheem sab nrauv lossis cov kab nruab nrab ntawm cov khoom.
4, lub layout yuav tsum muaj ib tug pre-layout ua ntej, tsis txhob tau txais lub rooj tsavxwm los pib lub layout ncaj qha, lub pre-layout yuav ua tau raws li cov module grab, nyob rau hauv lub PCB board los kos cov kab teeb liab khiav tsom, thiab ces raws li. nyob rau hauv lub teeb liab khiav tsom xam, nyob rau hauv lub PCB board los kos lub module auxiliary kab, soj ntsuam lub approximate txoj hauj lwm ntawm lub module nyob rau hauv lub PCB thiab qhov luaj li cas ntawm cov hauj lwm ntau yam. Kos lub auxiliary kab dav 40mil, thiab ntsuam xyuas qhov rationality ntawm layout ntawm modules thiab modules los ntawm cov saum toj no cov hauj lwm, raws li qhia nyob rau hauv daim duab hauv qab no.
5, qhov kev teeb tsa yuav tsum xav txog cov channel uas tawm ntawm txoj kab hluav taws xob, yuav tsum tsis txhob nruj heev, los ntawm kev npaj kom paub tseeb tias lub hwj chim los ntawm qhov twg mus, zuag cov ntoo fais fab.
6, thermal Cheebtsam (xws li electrolytic capacitors, siv lead ua oscillators) layout yuav tsum nyob deb ntawm lub hwj chim mov thiab lwm yam high thermal devices, kom deb li deb tau nyob rau hauv lub Upper vent.
7, kom ua tau raws li qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv, tag nrho pawg thawj coj saib kev sib npaug, tag nrho lub rooj tsav xwm thaiv channel reservation
Lub high-voltage thiab high-tam sim no signals yog tag nrho sib cais los ntawm cov tsis muaj zog cov cim qhia ntawm cov me me tam sim no thiab tsawg voltages. Lub high-voltage qhov chaw yog hollowed tawm nyob rau hauv tag nrho cov txheej tsis muaj tooj liab ntxiv. Qhov kev ncua deb ntawm qhov siab-voltage qhov chaw raug kuaj xyuas raws li tus qauv lub rooj
Cov teeb liab analog tau muab cais tawm ntawm cov teeb liab digital nrog qhov dav dav ntawm tsawg kawg 20mil, thiab cov analog thiab RF tau teeb tsa hauv '-' font lossis 'L' duab raws li qhov yuav tsum tau ua hauv cov qauv tsim.
Lub teeb liab siab zaus yog sib cais los ntawm lub teeb liab tsawg zaus, qhov kev sib cais deb yog tsawg kawg yog 3 hli, thiab qhov kev teeb tsa tus ntoo khaub lig tsis tuaj yeem ua kom ntseeg tau.
Cov txheej txheem ntawm cov teeb liab tseem ceeb xws li siv lead ua oscillator thiab moos tsav tsheb yuav tsum nyob deb ntawm lub interface Circuit Court layout, tsis nyob ntawm ntug ntawm lub rooj tsavxwm, thiab tsawg kawg yog 10 hli ntawm ntug ntawm lub rooj tsavxwm. Cov siv lead ua thiab siv lead ua oscillator yuav tsum muab tso rau ze ntawm lub nti, muab tso rau hauv tib txheej, tsis txhob punch qhov, thiab cia qhov chaw rau hauv av.
Tib cov qauv Circuit Court txais cov qauv "symmetrical" layout (ncaj rov siv dua ntawm tib lub module) kom tau raws li qhov sib xws ntawm lub teeb liab
Tom qab kev tsim ntawm PCB, peb yuav tsum ua kev soj ntsuam thiab tshuaj xyuas kom cov khoom tsim tau zoo dua.