Fomura yeCapacitance muPCB Design

Kugona kwesimba kunokanganisa kuchengetwa kwesimba, kusefa, nguva, kubatana, uye kusimba kwesimba muchigadzirwa chemagetsi. Mukugadzirwa kwePCB, fomura yekutanga ndiyo chete pokutangira: maitiro chaiwo anoenderanawo nekusarura kwemagetsi, kushivirira, ESR, ESL, kuiswa, uye impedance inogadzirwa nehurongwa.

Chinyorwa chino chinobatanidza fomura ye capacitance nesarudzo dzinoshanda mukusarudza zvikamu uye kuungana kwePCB.

Zviri mukati

• Fomura yeCapacitance
• Maitiro Echokwadi Ekugadzirisa Capacitor
• Kubatanidza uye Kuvimbika Kwesimba
• PCB Parasitic Capacitance
• Kusarudzwa kweZvikamu uye Kuungana
• Ongororo Yekugadzira NeHighleap Electronics

Fomura yeCapacitance

Capacitance inotsanangurwa seC = Q / V , apo C iri capacitance, Q iri charge inochengetwa, uye V iri voltage. Kuti ive parallel-plate structure yakakodzera, capacitance inoyerwa neC = epsilon A / d : permittivity inowanziridzwa nenzvimbo yeplate uye inokamurwa nedaro rekupatsanurana.

Hukama uhu hunotsanangura kuti nei hunhu hwe dielectric, conductor geometry, uye spacing zvichikosha muzvikamu zvese uye maumbirwo ePCB. Hazvifemberi, zvega, maitiro e high-frequency e capacitor yakasungirirwa.

Maitiro Echokwadi Ekugadzirisa Capacitor

Capacitor chaiyo inosanganisira kuramba zvipembenene uye inductance. Sezvo frequency ichiwedzera, zvipembenene izvozvo zvinogona kutonga uye kugadzira nzvimbo inozvigadzirisa pachayo pamusoro payo iyo chikamu chisisiri kuita sechinhu chakakodzera che capacitive.

Ongorora data rechikamu kuti uone kana paine capacitance tolerance, DC-bias behavior, tembiricha characteristics, ESR, uye impedance curves. Izvi zvinonyanya kukosha kana MLCCs dzichishandiswa pedyo nevoltage yadzo yakayerwa kana mukushandiswa kwe wide-temperature.

Kubatanidza uye Kuvimbika Kwesimba

Ma capacitor anobvisa magetsi anoburitsa magetsi madiki ari pedyo neIC uye anoderedza kufamba kwemagetsi pachiteshi chemagetsi. Kushanda kwawo kunokanganiswa zvakanyanya nerukoko runoumbwa ne capacitor, power pin, ground return, uye vias.

• Isa ma decouplers madiki-diki ane ma frequency akakwirira pedyo nema power pins akakodzera.
• Shandisai nzira pfupi, dzakafara uye nzira inoenderera mberi yekubatanidza kana zvichibvira.
• Sarudza kukosha kwe capacitance kubva kuIC guide uye power-demand profile yakayerwa kana yakaedzwa.

PCB Parasitic Capacitance

Zvinhu zvemhangura zviri pedyo zvinoumbawo capacitance. Mapurani maviri, matrace pamusoro pemareferensi, mapedhi, uye maumbirwo econnector zvinogona kukanganisa mipendero yesignal, coupling, uye impedance. Mumagadzirirwo e controlled-impedance, stack-up data uye field-solver calculations zvakavimbika kupfuura mitemo.

Chengeta mambure anonzwa akaparadzaniswa nemanode anochinja-chinja ane ruzha, uye chengetedza nzira yakajeka yekudzoka kuitira kuti zvipembenene zvisingadzivisike zvisagadzire kubatana kweruzha kusingatarisirwi.

Kusarudzwa kweZvikamu uye Kuungana

Sarudza mapakeji e capacitor uye marudzi e dielectric kubva pamagetsi ekushanda, huwandu hwema frequency, tembiricha, kugadzikana kunodiwa, uye zvirambidzo zve assembly. Mapakeji madiki kwazvo anoderedza inductance ye mounting asi anogona kubatwa zvakanyanya nekutsemuka kwe flex kana board kana maitiro e depaneling asina kudzorwa.

Mapatani epasi, maburi ekusolder paste, reflow profile, uye rutsigiro rwebhodhi zvinofanirwa kuongororwa pamwe chete kuti zviunganidzwe zvakanaka.

Ongororo Yekugadzira NeHighleap Electronics

Highleap Electronics inogona kuongorora mapatani enzvimbo ye capacitor, zvirambidzo zvekuisa, ruzivo rwekuunganidzwa, uye zvinodiwa pakugadzira zvinhu zvisati zvagadzirwa. Kupa simba rakakosha remagetsi uye chero zvinodiwa zve impedance kunoita kuti ongororo yacho ive yakatarisana zvakanyanya.

Kuti muwane ongororo yekugadzirwa kwezvinhu, kumbirai mutengo wePCB une mafaira eGerber, BOM, uye manyorerwo akakodzera.