MOSFET Package Inoshandura Tube Sarudzo uye Circuit Diagram

Danho rekutanga kuita sarudzo yeMOSFETs, iyo inouya mumhando mbiri huru: N-channel uye P-channel. Mumagetsi masisitimu, maMOSFET anogona kufungidzirwa semagetsi emagetsi. Kana iyo yakanaka voltage yawedzerwa pakati pegedhi uye sosi yeN-channel MOSFET, switch yayo inoitisa. Munguva yekufambisa, ikozvino inogona kuyerera kuburikidza nekuchinja kubva kudhaini kusvika kune kwakabva. Pane kupokana kwemukati pakati pemvura uye sosi inonzi on-resistance RDS(ON). Izvo zvinofanirwa kuve pachena kuti gedhi reMOSFET inzvimbo yakakwira impedance terminal, saka voltage inogara ichiwedzerwa kugedhi. Uku ndiko kupikisa pasi iyo gedhi rakabatanidzwa kune mudhiyabhorosi wedunhu wakaratidzwa gare gare. Kana gedhi rikasiiwa rakarembera, mudziyo haushande sezvakagadzirwa uye unogona kudzima kana kudzima panguva dzisina kukodzera, zvichikonzera kurasikirwa kwesimba muhurongwa. Kana iyo voltage pakati pechitubu negedhi iri zero, switch inodzima uye ikozvino inomira kuyerera nemuchina. Kunyangwe mudziyo wakadzimwa panguva ino, pachine chidiki chiripo, chinonzi leakage current, kana IDSS.

 

 

Danho 1: Sarudza N-channel kana P-channel

Danho rekutanga pakusarudza mudziyo wakakodzera wedhizaini kusarudza kushandisa N-channel kana P-channel MOSFET. mune yakajairika simba application, kana MOSFET yakadzikwa uye mutoro wakabatana netrunk voltage, iyo MOSFET inoumba yakaderera voltage side switch. Mune yakaderera voltage side switch, N-channelMOSFETinofanira kushandiswa nekuda kwekufunga kwevoltage inodiwa kudzima kana kuvhura mudziyo. Kana iyo MOSFET yakabatana nebhazi uye mutoro wakadzikwa, iyo yakakwira voltage side switch inofanirwa kushandiswa. A P-channel MOSFET inowanzo shandiswa mune iyi topology, zvakare kune voltage drive kufunga.

Danho rechipiri: Sarudza chiyero chazvino

Nhanho yechipiri ndeyekusarudza chiyero chazvino cheMOSFET. Zvichienderana nemaitiro edunhu, iyi chiyero chemazuva ano chinofanirwa kunge chiri chepamusoro ikozvino iyo mutoro unogona kumira pasi pemamiriro ese. Zvakafanana nenyaya yevoltiji, mugadziri anofanirwa kuve nechokwadi chekuti MOSFET yakasarudzwa inogona kumira nechiyero chazvino, kunyangwe iyo system iri kugadzira spike currents. Iwo maviri azvino makesi akatariswa ndeye inoenderera modhi uye pulse spikes. Iyi parameter yakavakirwa paFDN304P chubhu DATASHEET sereferensi uye maparamita anoratidzwa mumufananidzo:

 

 

 

Mukuenderera mberi kwekuita modhi, iyo MOSFET iri munzvimbo yakatsiga, kana yazvino ichiyerera ichienderera kuburikidza nemudziyo. Pulse spikes ndeye kana paine huwandu hukuru hwekuvhiya (kana spike ikozvino) inoyerera nemumudziyo. Kana iyo yakanyanya ikozvino pasi pemamiriro ezvinhu aya yakatemwa, ingori nyaya yekusarudza zvakananga mudziyo unokwanisa kumirisana nehukuru huno.

Mushure mekusarudza yakayerwa ikozvino, iwe unofanirwawo kuverenga kurasikirwa kwekuita. Mukuita, theMOSFEThaisi iyo yakakodzera mudziyo, nekuti mune conductive process pachava nekurasikirwa kwesimba, iyo inonzi conduction kurasikirwa. MOSFET mu "pa" senge inosiyana kuramba, inotemerwa nemudziyo RDS (ON), uye nekushisa uye nekuchinja kukuru. Kuraswa kwesimba kwechishandiso kunogona kuverengerwa kubva kuIload2 x RDS (ON), uye sezvo iyo-inopikisa ichisiyana nekupisa, kupera kwemagetsi kunosiyana zvichienderana. Iyo yakakwirira iyo VGS yakashandiswa kune MOSFET, iyo idiki iyo RDS (ON) ichave; ukuwo iyo yakakwirira iyo RDS(ON) ichave. Kune sisitimu dhizaini, apa ndipo panopinda tradeoffs zvichienderana neiyo system voltage. Kune madhizaini anotakurika, zviri nyore (uye zvakajairika) kushandisa yakaderera voltages, nepo kune maindasitiri madhizaini, yakakwirira voltages inogona kushandiswa. Ziva kuti iyo RDS(ON) kuramba inokwira zvishoma neyazvino. Misiyano mumhando dzakasiyana dzemagetsi eiyo RDS (ON) resistor inogona kuwanikwa mune tekinoroji data sheet rinopihwa nemugadziri.

 

 

 

Danho rechitatu: Sarudza Zvinodiwa zveThermal

Nhanho inotevera pakusarudza MOSFET ndeyekuverengera zvinodikanwa zvekupisa zvehurongwa. Mugadziri anofanira kufunga nezvezviitiko zviviri zvakasiyana, iyo yakaipisisa kesi uye yechokwadi kesi. Iko kuverenga kweiyo yakaipisisa-mamiriro ezvinhu inokurudzirwa nekuti iyi mhedzisiro inopa yakakura muganho wekuchengetedza uye inova nechokwadi chekuti sisitimu haikundike. Kune zvakare zvimwe zviyero zvekuziva paMOSFET data sheet; senge thermal kuramba pakati pe semiconductor junction yeyakaputirwa mudziyo uye nharaunda, uye yakanyanya tembiricha yekusangana.

 

Tembiricha yekusangana kwechishandiso yakaenzana neyakakura ambient tembiricha pamwe neyakagadzirwa kupisa kwekupisa uye kupera simba (junction tembiricha = yakanyanya ambient tembiricha + [thermal resistance × power dissipation]). Kubva pane iyi equation iyo yakanyanya simba dissipation yehurongwa inogona kugadziriswa, inova netsanangudzo yakaenzana neI2 x RDS (ON). Sezvo vashandi vakatemesa huwandu hwazvino huchapfuura nemumudziyo, RDS (ON) inogona kuverengerwa tembiricha dzakasiyana. Zvakakosha kuziva kuti pakubata nemhando dzakareruka dzekupisa, mugadziri anofanirawo kufunga nezvekupisa kwesimba re semiconductor junction / device case uye nyaya / nharaunda; kureva, zvinodikanwa kuti bhodhi redunhu rakadhindwa uye pasuru hazvidziye nekukurumidza.

Kazhinji, PMOSFET, pachange paine parasitic diode iripo, basa re diode ndere kudzivirira sosi-drain reverse connection, yePMOS, mukana wepamusoro weNMOS ndewekuti vhezheni yayo inogona kuve 0, uye musiyano wevoltage pakati pe DS voltage haina kuwanda, nepo NMOS pamamiriro ezvinhu inoda kuti VGS ive yakakura kupfuura chikumbaridzo, izvo zvinozotungamira kune yekudzora voltage isingadzivisike yakakura kupfuura inodiwa voltage, uye pachave nedambudziko risingakoshi. PMOS inosarudzwa senge switch yekudzora kune maviri anotevera maapplication:

 

Tembiricha yekusangana kwechishandiso yakaenzana neyakakura ambient tembiricha pamwe neyakagadzirwa kupisa kwekupisa uye kupera simba (junction tembiricha = yakanyanya ambient tembiricha + [thermal resistance × power dissipation]). Kubva pane iyi equation iyo yakanyanya simba dissipation yehurongwa inogona kugadziriswa, inova netsanangudzo yakaenzana neI2 x RDS (ON). Sezvo mugadziri akateya iyo yakanyanya ikozvino ichapfuura nepamudziyo, RDS (ON) inogona kuverengerwa tembiricha dzakasiyana. Zvakakosha kuziva kuti pakubata nemhando dzakareruka dzekupisa, mugadziri anofanirawo kufunga nezvekupisa kwesimba re semiconductor junction / device case uye nyaya / nharaunda; kureva, zvinodikanwa kuti bhodhi redunhu rakadhindwa uye pasuru hazvidziye nekukurumidza.

Kazhinji, PMOSFET, pachange paine parasitic diode iripo, basa re diode ndere kudzivirira sosi-drain reverse connection, yePMOS, mukana wepamusoro weNMOS ndewekuti vhezheni yayo inogona kuve 0, uye musiyano wevoltage pakati pe DS voltage haina kuwanda, nepo NMOS pamamiriro ezvinhu inoda kuti VGS ive yakakura kupfuura chikumbaridzo, izvo zvinozotungamira kune yekudzora voltage isingadzivisike yakakura kupfuura inodiwa voltage, uye pachave nedambudziko risingakoshi. PMOS inosarudzwa senge switch yekudzora kune maviri anotevera maapplication:

Tichitarisa dunhu iri, chiratidzo chekudzora PGC chinotonga kuti V4.2 inopa simba kuP_GPRS here kana kuti kwete. Iri redunhu, sosi uye materminal terminals haana kubatana kune reverse, R110 uye R113 iripo mupfungwa yekuti R110 yekudzora gedhi ikozvino haina kunyanyisa, R113 inodzora gedhi rezvakajairwa, R113 kudhonza-kumusoro kumusoro, sePMOS. , asi zvakare inogona kuoneka sekudhonza-kumusoro pane yekudzora chiratidzo, kana MCU yemukati mapini uye kudhonza-kumusoro, ndiko kuti, kubuda kweiyo yakavhurika-drain kana iyo yakabuda yakavhurika-drain, uye haigone kutyaira iyo PMOS. kudzima, panguva ino, zvinodikanwa kune ekunze voltage yakapihwa kudhonza-kumusoro, saka resistor R113 inotamba mabasa maviri. Ichada yekunze voltage kuti ipe iyo yekudhonza-kumusoro, saka resistor R113 inotamba mabasa maviri. r110 inogona kuva idiki, kusvika ku100 ohms inogona zvakare.