Cov teeb meem dab tsi yuav tsum raug sau tseg hauv kev tsim qauv ntawm TVS diodes hauv cov khoom siv sib txuas lus?

Ib, Precise tswj ntawm lub cev qhov chaw layout
1. Kev ua kom zoo ntawm qhov sib txuas ntawm qhov sib txuas ntawm qhov chaw tiv thaiv thiab cuam tshuam
TVS diodes yuav tsum tau muab tso rau hauv thaj tsam kev sib tshuam ntawm cov kab teeb liab thiab sab nraud interfaces, xws li USB interfaces, Ethernet ports, kav hlau txais xov connectors, thiab lwm yam Qhov kev teeb tsa no tuaj yeem txo qhov cuam tshuam ntawm cov kab mob parasitic inductance ntawm clamp voltage. Kev sim cov ntaub ntawv qhia tau hais tias thaum qhov kev ncua deb ntawm TVS thiab interface yog luv los ntawm 20mm mus rau 5mm, qhov hloov pauv amplitude ntawm clamp voltage yuav raug txo los ntawm 40%.
2. Kev xa tawm ntawm pawg tiv thaiv
Hauv siab -cov teeb liab ceev xws li HDMI 2.1 thiab PCIe 5.0, yuav tsum muaj ntau-channel TVS array kom ua tiav qhov sib txawv ntawm kev tiv thaiv. 5G lub hauv paus chaw nres tsheb tsim cov ntaub ntawv qhia tau hais tias siv 4-channel TVS chips nyob rau hauv 10mm ntau yam ntawm cov teeb liab sib txawv nkag mus rau PCB, ua ke nrog 3D electromagnetic simulation los ua kom zoo tshaj qhov kev sib txuas lus, txo qis inter channel crosstalk mus rau hauv qab -60dB. Qhov kev teeb tsa no tuaj yeem cuam tshuam cov kev hloov pauv ntawm hom kev cuam tshuam rau cov teeb liab sib txawv.
3. Stereoscopic kev tsim kho ntawm qib kev tiv thaiv
Rau ntau- txheej PCB tsim, peb yuav tsum tau tsim kom muaj peb- theem kev tiv thaiv "interface tiv thaiv txheej tiv thaiv txheej tiv thaiv txheej txheej tseem ceeb" yuav tsum tau tsim. Cov ntaub ntawv hloov chaw tsim qauv siv cov qauv no: SMD ntim TVS tau muab tso rau ntawm txheej txheej interface, PTH ntim siab -lub zog TVS tau teeb tsa ntawm lub dav hlau fais fab, thiab lub peev xwm qis TVS array tau teeb tsa hauv CPU core cheeb tsam. Qhov kev tiv thaiv txheej no ua rau muaj kev vam meej ntawm cov cuab yeej dhau IEC 61000-4-5 8/20 μs 6kV surge test rau 99.7%.
2, Standardization Kev Siv Hluav Taws Xob Kev Txuas Hluav Taws Xob
1. Kev kho qhov sib txawv ntawm cov txheej txheem hauv av
Txoj kev hauv av ntawm TVS yuav tsum ua raws li lub hauv paus ntsiab lus ntawm "kev sib thooj ywj pheej tsis muaj zog". Tus tsim ntawm ib lub tsheb sib txuas lus module qhia tau hais tias TVS grounding pin yog txuas ncaj qha mus rau sab hauv GND tooj liab ntawv ci los ntawm plaub los ntawm qhov, ua ke nrog ib tug 0.5mm dav luv tooj liab sawb, kom txo tau lub grounding impedance rau hauv qab no 3m Ω. Rau cov khoom siv nrog cov hlau casings, nws raug nquahu kom siv "lub hnub qub zoo li lub hauv paus" qauv, qhov twg TVS grounding pin txuas nrog lub casing grounding kem los ntawm cov xov hlau ywj siab kom tsis txhob tsim lub voj voog nrog cov hauv av digital.
2. Kev ntseeg ruaj khov ntawm lub teeb liab Circuit Court
Hauv kev tiv thaiv cov teeb liab sib txawv, nws yog ib qho tsim nyog los xyuas kom meej tias lub hauv paus tus pin ntawm TVS tsim qhov tsawg kawg nkaus lub voj voog nrog cov teeb liab rov qab txoj kev. Ib qho 10Gbps optical module tsim tau txais "coplanar waveguide + TVS tiv thaiv" qauv, qhov twg TVS nti yog siv ncaj qha rau hauv qab ntawm qhov sib txawv, thiab teeb liab rov qab los ntawm 0.2mm tuab sab hauv GND dav hlau. Cov txiaj ntsig simulation qhia tau hais tias qhov kev teeb tsa no tswj hwm qhov sib txawv impedance hloov pauv hauv ± 5% thiab nce qhov muag daim duab paj los ntawm 15%.
3. Rov qab tsim kev tiv thaiv network
Rau cov teeb liab tseem ceeb, nws raug pom zoo kom txais yuav ib qho kev tiv thaiv dual ntawm "kev tiv thaiv tseem ceeb + kev tiv thaiv kev tiv thaiv". Ib lub davhlau ya nyob twg kev sib txuas lus satellite yog tsim los siv lub ntsiab TVS array nyob rau hauv RF pem hauv ntej-kawg thaum ntxiv ib qho kev pabcuam TVS ntawm cov khoom siv sib xyaw, thiab ob qho yog hluav taws xob cais los ntawm cov hlaws sib nqus. Qhov kev tsim no ua kom paub tseeb tias cov cuab yeej tswj hwm qhov kev ua yuam kev ntawm 10 ^ -12 thaum raug rau IEC 61000-4-2 ± 15kV tiv tauj tawm.
3, Kev Ua Haujlwm Kev Ua Haujlwm ntawm Kev Ruaj Ntseg Kev Ruaj Ntseg
1. Zoo tuned tswj cov kab mob parasites
TVS ntim tsis muaj qhov cuam tshuam loj rau cov teeb liab zoo. Ib qho kev sib piv ntawm kev tsim lub siab - ceev ADC Circuit Court qhia tau hais tias siv 0402 pob TVS (parasitic inductance ntawm 0.5nH) nce S21 parameter los ntawm 2dB piv rau 0603 pob (parasitic inductance ntawm 1.2nH). Rau GHz theem teeb liab, nws raug nquahu kom siv cov pob inductance qis xws li DFN thiab QFN, thiab ua kom zoo dua cov ntaub qhwv ntsej muag los ntawm 3D electromagnetic teb simulation los tswj cov kab mob parasitic nyob rau hauv ib qho kev pom zoo.
2. Impedance txuam ntawm kev tiv thaiv network
Nyob rau hauv siab - ceev digital interfaces, TVS tiv thaiv tes hauj lwm yuav tsum ua kom tiav impedance txuam nrog cov kab sib kis. Lub PCIe 4.0 interface tsim tau txais cov tswv yim sib txuam ntawm "TVS + series resistor", uas txo cov impedance ntawm kev tiv thaiv ntawm 120 Ω txog 100 Ω ± 5% los ntawm kev kho tus nqi resistor. Lub sij hawm sau qhov kev ntsuam xyuas qhia tau hais tias qhov tsim no txo ​​cov teeb liab overshoot los ntawm 30% thiab nce qhov muag qhov siab los ntawm 25%.
3. Kev sib koom ua kom zoo ntawm thermal tsim
Lub sijhawm hloov hluav taws xob ntawm TVS yuav ua rau muaj qhov kub thiab txias, cuam tshuam rau kev tiv thaiv kev ua haujlwm. Tus tsim ntawm lub siab - lub zog TVS module txais ib "tooj liab substrate + thermal ntawm" tshav kub dissipation qauv. Los ntawm kev teeb tsa 0.3mm txoj kab uas hla ntawm thermal ntawm array (qhov sib nrug ntawm 1.5mm) hauv qab lub nti, qhov sib txuas kub yog txo los ntawm 20 degree. Rau ntau-channel tiv thaiv daim ntawv thov, nws raug nquahu kom siv "staggered layout + thermal cais zawj" tsim los tiv thaiv kev ua haujlwm tsis zoo los ntawm thermal coupling.
4, Layout paradigm rau ib txwm siv scenarios
1. Fais fab chaw nres nkoj tiv thaiv layout
Hauv AC-DC hloov hluav taws xob circuits, TVS yuav tsum tau xa mus tom qab tus choj rectifier thiab ua ntej lub lim dej capacitor. Ib qho kev sib txuas lus siv hluav taws xob tsim qauv siv "π - hom filtering + TVS" qauv, nrog TVS txuas nrog rau qhov sib npaug ntawm cov khoom siv kawg thiab X / Y capacitors kom ua tiav ntau- qib kev tiv thaiv. Cov ntaub ntawv ntsuam xyuas qhia tau hais tias qhov kev teeb tsa no ua rau muaj kev cuam tshuam ntau hom kev cuam tshuam los ntawm 30dB thiab qhov sib txawv hom cuam tshuam kev cuam tshuam los ntawm 25dB.
2. RF pem hauv ntej -kawg tiv thaiv layout
Rau 5G NR cov chaw nres tsheb, TVS yuav tsum tau xa mus ua ntej lub suab nrov qis (LNA) thiab txais yuav ib qho kev tiv thaiv kev tiv thaiv ntawm "limiter + TVS". Qhov chaw nres tsheb macro hauv paus tsim qhia tau hais tias TVS nti tau xa tawm 15 hli tom qab lub kav hlau txais xov chaw nres nkoj, thiab lub limiter yog siv los ua kom tiav qhov kev tiv thaiv dynamic ntau ntawm -10dBm rau +25dBm. Qhov kev tsim qauv no tswj cov degradation ntawm kev txais rhiab heev hauv 0.5dB.
3. Layout ntawm siab - ceev digital interface tiv thaiv
Hauv 100G Ethernet interface, TVS kev tiv thaiv yuav tsum tau tsim ua ke nrog Retimer. Cov ntaub ntawv hloov chaw tsim qauv siv cov qauv "TVS array + hom choke" qauv, xa TVS ntawm cov tswv yim ntawm re timer, thiab kho qhov inductance ntawm choke coil (100nH @ 100MHz) Paub qhov sib npaug ntawm kev tiv thaiv thiab teeb liab kev ncaj ncees. Kev ntsuam xyuas tau pom tias qhov kev tsim qauv no tsis tu ncua tswj qhov kev ua yuam kev hauv qab 10 ^ -15.
5, Validation thiab Optimization Methodology
1. Simulation pov thawj system
Tsim kom muaj ntau qhov kev txheeb xyuas qhov tseeb uas muaj SPICE circuit simulation, 3D electromagnetic simulation, thiab thermal simulation. Kev sib txuas lus module tsim tau zoo rau TVS layout los ntawm Ansys HFSS simulation, ua rau 40% nce hauv ESD tiv thaiv efficiency; Txheeb xyuas cov teeb liab kev ncaj ncees los ntawm Cadence Sigrity simulation kom paub meej 100% dhau tus nqi rau qhov muag daim duab qauv.
2. Cov txheej txheem kuaj thiab pov thawj
Tsim kom muaj ib qho kev siv tau zoo dua ntawm "kev sim kuaj + ntawm- qhov chaw sim". Kev ntsuam xyuas hauv chav kuaj yuav tsum them rau IEC 61000-4 series qauv, thiab kev ntsuam xyuas ntawm qhov chaw yuav tsum tsom mus rau kev txheeb xyuas qhov kev tiv thaiv kev ua haujlwm hauv ib puag ncig electromagnetic complex. Ib yam khoom siv kev sib txuas lus tsheb ciav hlau tau sau ntau dua 2000 cov ntaub ntawv ESD tshwm sim los ntawm kev sim tiag tiag ntawm 10 qhov chaw nres tsheb, thiab txuas ntxiv txhim kho txoj kev tiv thaiv zoo.
3. Kev soj ntsuam tsis ua haujlwm
Tsim kom muaj TVS tsis ua hauj lwm database thiab ua lub hauv paus ua rau kev soj ntsuam ntawm cov hom tsis ua hauj lwm xws li qhib Circuit Court, luv Circuit Court, thiab to. Qee qhov xwm txheej qhia tau hais tias qhov ua tsis tiav los ntawm TVS ncoo tawg nyiaj rau 35%. Los ntawm kev ua kom zoo ntawm PCB pawg tsim thiab cov txheej txheem soldering, qhov ua tsis tiav ntawm hom no tau raug txo qis rau qis dua 0.5%.
https://www.trrsemicon.com/transistor/voltage-regulators/surface-mount-super-fast-recovery-rectifier.html