IiMfuno zeSekethe yoMqhubi weMOSFET

Ngabaqhubi be-MOS banamhlanje, kukho iimfuno ezininzi ezingaqhelekanga:

1. Ukusetyenziswa kwamandla ombane aphantsi

Xa isicelo sokutshintsha kwe-5Vukunikezwa Amandla, Ngeli xesha ukuba ukusetyenziswa kwesakhiwo sepali yetotem yesiko, kuba i-triode ibe yi-0.7V kuphela phezulu kunye nelahleko ephantsi, okukhokelela kwisango elithile lokugqibela lomthwalo kwi-voltage kuphela 4.3V, ngeli xesha, ukusetyenziswa kombane ovumelekileyo wesango. ye 4.5VIi-MOSFETs kukho umlinganiselo othile womngcipheko.Imeko efanayo kwakhona kwenzeka kwisicelo se-3V okanye enye i-low-voltage switching power supply.

2.Ukusetyenziswa kombane obanzi

I-voltage engundoqo ayinalo ixabiso lamanani, iyahluka ukusuka kumaxesha ngamaxesha okanye ngenxa yezinye izinto. Olu tshintsho lubangela ukuba amandla ombane okuqhuba anikwe i-MOSFET yisekethe ye-PWM angazinzi.

Ukuze kukhuselwe ngcono i-MOSFET kumbane wesango eliphezulu, ii-MOSFET ezininzi zifakele izilawuli zombane ukuze zinyanzelise umda kubukhulu bamandla ombane wesango. Kule meko, xa i-voltage ye-drive iziswe ukuba idlule i-voltage ye-regulator, ilahleko enkulu yomsebenzi we-static ibangelwa.

Kwangaxeshanye, ukuba umgaqo osisiseko we-resistor voltage divider usetyenziselwa ukunciphisa i-voltage yesango, kuya kwenzeka ukuba i-voltage efakwe isitshixo iphezulu, i-MOSFET isebenza kakuhle, kwaye ukuba i-voltage ye-keyed iyancipha, i-voltage yesango ayikho. ngokwaneleyo, okubangela ukungonelanga kokuvula kunye nokucima, okuya kwandisa ilahleko yokusebenza.

I-MOSFET overcurrent protection circuit ukuphepha unikezelo lombane iingozi zokudinwa(1)

3. Ukusetyenziswa kwamandla ombane amabini

Kwezinye iisekethe zolawulo, inxalenye yengqiqo yesekethe isebenzisa i-5V okanye i-3.3V yombane wedatha eqhelekileyo, ngelixa isahlulo samandla esiphumayo sisebenza kwi-12V okanye ngaphezulu, kwaye i-voltages ezimbini zixhunyiwe kumhlaba oqhelekileyo.

Oku kuyenza icace into yokuba isekethi yonikezelo lombane kufuneka isetyenziswe ukuze icala lamandla ombane aphantsi libe nokukhohlisa ngokufanelekileyo i-MOSFET yamandla ombane aphezulu, ngelixa amandla ombane aphezulu i-MOSFET iya kukwazi ukumelana nobunzima obufanayo obukhankanywe ku-1 no-2.

Kwezi meko zintathu, ukwakhiwa kwe-totem pole akukwazi ukuhlangabezana neemfuno zemveliso, kwaye ezininzi ezikhoyo zomqhubi we-MOS ICs azibonakali ziquka ukwakhiwa kokunciphisa umbane wesango.