Yuav ua li cas siv diodes los txo qhov tsis ua hauj lwm ntawm kev sib txuas lus circuits?

1, Hom kev ua txhaum ntawm kev sib txuas lus circuits thiab tus nqi ntawm kev tiv thaiv diode
Kev sib txuas lus circuits ntsib peb qhov teeb meem txhaum cai:
Transient overvoltage surge: xob laim induced voltage tuaj yeem ncav cuag 6kV, ESD mem tes peak tam sim no tuaj yeem ncav cuag 30A, uas tuaj yeem ua rau nti tawg yooj yim.
Signal integrity degradation: High speed differential signals (such as PCIe 6.0) are sensitive to parasitic parameters, and devices with junction capacitance>0.5pF yuav ua rau muaj qhov nce me ntsis yuam kev.
Rov qab kev puas tsuaj tam sim no: Lub zog rov qab hluav taws xob tsim tawm thaum cov khoom siv inductive (xws li transformers thiab relays) raug tua tuaj yeem ncav cuag ntau pua volts, uas tuaj yeem ua rau tawg ntawm cov khoom siv hluav taws xob tau yooj yim.
Noj hom -C interface ua piv txwv, nws qhov siab - cov ntaub ntawv ceev channel yuav tsum tau siv DW05-4R2PC-S ESD diode, uas txhawb nqa ± 25kV huab cua tawm tiv thaiv thiab muaj qhov sib txuas ntawm qhov tsuas yog 0.2pF. Nws tuaj yeem txo qhov kev ua yuam kev me ntsis kom qis dua 10 ^ -15 thiab ua tau raws li cov kev cai nruj ntawm USB4 raws tu qauv rau teeb liab kev ncaj ncees.
2, Cov txheej txheem kev ua haujlwm thiab kev ua txhaum cai rau kev xaiv diode
1. Core parameter piv
Rov qab ua haujlwm Voltage (VRMM): Nws yuav tsum yog 1.2 npaug siab dua qhov siab tshaj plaws kev khiav hauj lwm voltage ntawm lub interface. Piv txwv li, cov khoom siv nrog VRMM Ntau dua lossis sib npaug ntawm 6V yuav tsum raug xaiv rau 5V fais fab mov interface kom tsis txhob muaj qhov yuam kev tshwm sim nyob rau hauv ib txwm ua haujlwm voltage.
Clamp voltage (VC): Nws yuav tsum qis dua qhov tawg ntawm qhov tiv thaiv nti. Lub HDMI 2.1 interface xav tau cov khoom siv tiv thaiv nrog VC Tsawg dua lossis sib npaug ntawm 8V los tiv thaiv kev puas tsuaj overvoltage.
Dynamic resistance (RDYN): cuam tshuam cov lus teb ceev ceev, nrog rau tus nqi qis dua lossis sib npaug li 0.5 Ω kom nrawm nrawm zog.
Junction capacitance (CT): Kev kub ceev interfaces xav tau CT Tsawg dua lossis sib npaug rau 1pF, thaum PCIe 5.0 interfaces xav tau cov khoom siv nrog CT Tsawg dua lossis sib npaug li 0.1pF kom tsis txhob muaj teeb liab attenuation thiab jitter.
2. Topology adaptation
Kev tiv thaiv ib qho kawg nkaus: siv unidirectional diodes, xws li SMBJ5.0A nrog UART interface, tuaj yeem cuam tshuam ± 15kV ESD.
Kev tiv thaiv cov teeb liab sib txawv: Dual channel integrated li yuav tsum tau, xws li DW24P4N3-S siv rau CAN tsheb npav, uas txhawb nqa 150A surge tam sim no thiab zam hom kev cuam tshuam los ntawm kev tiv thaiv ib leeg.
Kev sib koom ua ke ntau channel: Hom -C interface txais DW05-6R1N-E thiab koom ua ke 6-channel kev tiv thaiv, txuag ntau dua 30% ntawm PCB qhov chaw thiab txo qhov kev pheej hmoo ntawm kev ua tsis tiav los ntawm qhov tsis sib xws ntawm cov khoom sib cais.
3, Diode tiv thaiv cov txheej txheem rau kev sib txuas lus sib txuas
1. USB interface tiv thaiv architecture
USB 3.0/3.1 interface yuav tsum muaj peb - qib tiv thaiv:
Qib 1: TVS diode (xws li SMBJ6.0CA) suppresses ± 15kV ESD nrog lub sij hawm teb ntawm<1ns.
Qib thib ob: Hom hom choke (xws li DLW21SN) lim tawm cov suab nrov hom, nrog rau qhov poob qis dua lossis sib npaug rau 0.5dB@1GHz .
Qib thib peb: Tsawg capacitance ESD diodes (xws li USBLC6-2SC6) ua tiav kev tiv thaiv zaum kawg, nrog rau kev sib txuas ntawm lub peev xwm tsuas yog 0.5pF, uas tuaj yeem txo qhov yuam kev me ntsis kom qis dua 10 ^ -15.
2. Ethernet interface tiv thaiv txheej txheem
Gigabit Ethernet interfaces yuav tsum sib npaug tiv thaiv thiab teeb liab zoo:
PHY nti pem hauv ntej-kawg: Siv ob-directional TVS diodes (xws li PESD5V0S1BA), clamp voltage Tsawg dua los yog sib npaug rau 6V, to tam sim no ＜ 1 μ A.
Transformer theem nrab: Integrated gas discharge tube (GDT) thiab PTC tus kheej rov qab fuse, ua tiav 6kV surge tiv thaiv nyob rau hauv 8/20 μs waveform.
Cable kawg: Nruab nrog RJ45 interface thiab ua tau -nyob rau hauv kev tiv thaiv module, nws txhawb 8kV tiv tauj tawm thiab txo qhov tsis ua hauj lwm tus nqi qis dua 0.1ppm.
3. Wireless kev sib txuas lus module tiv thaiv
5G module tiv thaiv yuav tsum tau them sai sai rau siab - zaus yam ntxwv:
Kav hlau txais xov chaw nres nkoj: Siv ultra- tsis tshua muaj peev xwm Schottky diode (xws li BAT54C), hlws ris capacitance Tsawg dua los yog sib npaug rau 0.8pF, qhov poob qis dua lossis sib npaug rau 0.3dB@6GHz .
Lub hwj chim tus pin: Siv lub Zener diode (xws li 1N4733A) kom tswj tau 5.1V voltage stabilization thiab kub coefficient tsawg dua los yog sib npaug rau ± 50ppm / degree.
Cov ntaub ntawv tsheb npav: siv siab -ceev ESD array (xws li ESD5Z5.0T1G), lub sijhawm teb<100ps, supporting 10Gbps data rate.
4, Cov ntsiab lus tseem ceeb hauv kev ua haujlwm engineering
1. PCB layout optimization
Routing lub tswv yim: Cov cuab yeej tiv thaiv yuav tsum tau muab tso rau ze ntawm lub interface, nrog rau qhov sib txawv ntawm qhov sib txawv ntawm qhov ntev ntawm qhov sib txawv tsawg dua lossis sib npaug li 5ml kom tsis txhob muaj lub sijhawm sib txawv.
Kev kho hauv av: Lub hnub qub grounding yog saws, thiab hauv av ntawm cov cuab yeej tiv thaiv yog txuas nrog lub teeb liab hauv av los ntawm 0 Ω resistor txhawm rau txhawm rau cuam tshuam hauv av.
Thermal tsim: Cov khoom siv hluav taws xob siab (xws li DW24P4N3-S rau kev tuav 150A surges) xav tau kev teeb tsa ntawm cov dab dej kub, nrog rau qhov kub thiab txias tswj hauv qab 150℃kom tsis txhob thermal tsis ua haujlwm.
2. Cov txheej txheem kuaj thiab kuaj xyuas
Kev kuaj ESD: Tshawb xyuas siv tib neeg lub cev qauv (HBM) ± 8kV thiab tshuab qauv (MM) ± 200V, nrog rau qhov tsis ua haujlwm ntawm<1ppm.
Surge test: Raws li IEC 61000-4-5 tus qauv, siv 1.2 / 50 μs waveform los ntsuas qhov tsis ua haujlwm ntawm cov cuab yeej tiv thaiv, kom ntseeg tau tias nws siab dua 6kV.
Kev ntsuam xyuas kev ncaj ncees: Los ntawm kev txheeb xyuas qhov muag daim duab, xyuas kom meej tias jitter tsawg dua 50ps, tus nqi yuam kev yog tsawg dua 10 ^ -12, thiab ua tau raws li kev sib txuas lus raws tu qauv.
3. Fault tolerant tsim tswv yim
Kev tiv thaiv kev rov ua dua: Dual diodes tau txuas nrog rau qhov sib npaug ntawm qhov cuam tshuam tseem ceeb, xws li CC tus pin ntawm Hom -C interface, txhawm rau txo qhov kev pheej hmoo ntawm ib qho tsis ua tiav.
Kev kuaj mob tus kheej muaj nuj nqi: Kev tiv thaiv kev tiv thaiv kev tiv thaiv hluav taws xob ntsuas hluav taws xob, - lub sijhawm tshaj tawm ntawm ESD qhov xwm txheej zaus, thiab ceeb toom ntxov ntawm qhov ua yuam kev.
Kev sib cais tsis raug: Kev sib xyaw ua ke ntawm cov fuses nrawm nrawm thiab diodes yog siv los txiav tawm hauv Circuit Court thaum muaj overcurrent, zam kev sib kis ntawm qhov txhaum.

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