IiCapacitors zidlala indima ebalulekileyo kuyilo lwePCB enesantya esiphezulu kwaye zisoloko zisesona sixhobo sisetyenziswa kakhulu kwiPCBS.Kwi-PCB, ii-capacitors zihlala zihlulwe zibe yi-filter capacitors, i-decoupling capacitors, i-capacitors yokugcina amandla, njl.

I-1.I-capacitor yokuphuma kwamandla, i-capacitor yokucoca

Ngokuqhelekileyo sibhekisela kwi-capacitor yegalelo kunye neesekethe zemveliso yemodyuli yamandla njenge-filter capacitor.Ukuqonda okulula kukuba i-capacitor iqinisekisa ukuzinza kwegalelo kunye nokunikezelwa kwamandla okuphuma.Kwimodyuli yamandla, i-capacitor yokucoca kufuneka ibenkulu phambi kokuba encinci.Njengoko kubonisiwe kumfanekiso, i-capacitor yokucoca ibekwe enkulu kwaye incinci kwicala lotolo.

Xa uyila ukunikezelwa kwamandla, kufuneka kuqatshelwe ukuba i-wiring kunye nesikhumba sobhedu sibanzi ngokwaneleyo kwaye inani lemingxuma lanele ukuqinisekisa ukuba umthamo wokuhamba uhlangabezana neemfuno.Ububanzi kunye nenani lemingxuma ivandlakanywa ngokubambisana nekhoyo ngoku.

Amandla okufaka amandla

I-capacitor yegalelo lamandla yenza i-loop yangoku kunye ne-loop yokutshintsha.Le loop yangoku iyahluka nge-amplitude enkulu, i-Iout amplitude.I-frequency yi-frequency switching frequency.Ngexesha lenkqubo yokutshintsha i-chip ye-DCDC, i-current eveliswa yi-loop yangoku iyatshintsha, kubandakanywa ngokukhawuleza i-di/dt.

Kwimodi ye-BUCK ehambelanayo, indlela eqhubekayo yangoku kufuneka idlule kwi-pin ye-GND ye-chip, kunye ne-input capacitor kufuneka idibaniswe phakathi kwe-GND kunye ne-Vin ye-chip, ngoko indlela ingaba mfutshane kwaye inzima.

Ummandla wale ring yangoku incinci ngokwaneleyo, ngcono i-radiation yangaphandle yale ring yangoku iya kuba.

2.Ukuqhawula i-capacitor
Iphini yamandla ye-IC enesantya esiphezulu idinga i-decoupling capacitors eyaneleyo, ngokukodwa enye ipini nganye.Kuyilo lwangempela, ukuba akukho ndawo ye-decoupling capacitor, inokususwa ngokufanelekileyo.
I-decoupling capacitance ye-IC ye-pin yokubonelela ngombane idla ngokuba yincinci, njenge-0.1μF, 0.01μF, njl.Xa ubeka i-decoupling capacitors, la manqaku alandelayo kufuneka aqatshelwe.
(1)Yibeke kufutshane kangangoko kwiphini yonikezelo lombane, kungenjalo isenokungabi nasiphumo sokuqhawula.Ngokwethiyori, i-capacitor ine-radius ethile yokuqhawula, ngoko umgaqo wokusondela kufuneka uphunyezwe ngokungqongqo.
(2)I-capacitor yokuqhawuka kwisikhonkwane sonikezelo lombane kufuneka ibemfutshane kangangoko, kwaye ilothe kufuneka ibengqindilili, ngokuqhelekileyo ububanzi bomgca yi-8 ~ 15mil (1mil = 0.0254mm).Injongo yokuqina kukunciphisa i-lead inductance kunye nokuqinisekisa ukusebenza kokunikezelwa kwamandla.
(3) Emva kokunikezelwa kwamandla kunye nezikhonkwane zomhlaba ze-capacitor decoupling zikhokelwa ngaphandle kwe-welding pad, imingxuma ye-punch ekufutshane kwaye idibanise nombane kunye nendiza yomhlaba.Ilothe nayo kufuneka ijiye, kwaye umngxuma ube mkhulu kangangoko.Ukuba umngxuma onomngxuma oyi-10mil ungasetyenziswa, makungasetyenziswa umngxuma oyi-8mil.
(4)Qinisekisa ukuba i-loop yokudibanisa incinci kangangoko

I-3.I-capacitor yokugcina amandla
Indima ye-capacitor yokugcina amandla kukuqinisekisa ukuba i-IC inokubonelela ngamandla ngexesha elifutshane xa usebenzisa umbane.Umthamo we-capacitor yokugcina amandla ngokuqhelekileyo mkhulu, kwaye iphakheji ehambelanayo nayo inkulu.Kwi-PCB, i-capacitor yokugcina amandla ingaba kude nesixhobo, kodwa ingabi kude kakhulu, njengoko kuboniswe kumfanekiso.Ugcino lwamandla oluqhelekileyo lwe-capacitor fan-hole mode iboniswe kumfanekiso.

Imigaqo yemingxuma yeefeni kunye neentambo zezi zilandelayo:
(1) Ilothe imfutshane kwaye ingqindilili kangangoko kunokwenzeka, ukuze kubekho inductance encinci yeparasitic.
(2)Ii-capacitors zokugcina amandla, okanye izixhobo ezine-overcurrent enkulu, punch imingxuma emininzi kangangoko kunokwenzeka.
(3) Ngokuqinisekileyo, ukusebenza kakuhle kombane komngxuma wefeni ngumngxuma wediski.Ubunyani bufuna ukuqwalaselwa ngokubanzi