1. Ntchito Yoyendetsedwa ndi Voltage
Mosiyana ndi ma bipolar junction transistors (BJTs) omwe ndi zida zoyendetsedwa ndipano, ma MOSFET amphamvu amawongoleredwa ndi magetsi. Khalidwe lofunikirali lili ndi maubwino angapo:
- Zofunikira pagalimoto yosavuta
- Kugwiritsa ntchito mphamvu zochepa mumayendedwe owongolera
- Kutha kusintha mwachangu
- Palibe zovuta zina zakuwonongeka
Chithunzi 1: Zosavuta zoyendetsera zipata za MOSFET poyerekeza ndi ma BJT
2. Superior Kusintha Magwiridwe
Ma MOSFET amphamvu amapambana pamasinthidwe apamwamba kwambiri, omwe amapereka zabwino zambiri kuposa ma BJT achikhalidwe:
Chithunzi 2: Kusintha liwiro kuyerekezera pakati pa MOSFET ndi BJT
Parameter | Mphamvu MOSFET | BJT |
---|---|---|
Kusintha liwiro | Mwachangu Kwambiri (ns range) | Wapakati (μs osiyanasiyana) |
Kusintha Zotayika | Zochepa | Wapamwamba |
Maximum Kusintha pafupipafupi | > 1MHz | ~ 100 kHz |
3. Kutentha Makhalidwe
Ma MOSFET amphamvu amawonetsa mawonekedwe apamwamba kwambiri omwe amathandizira kudalirika kwawo komanso magwiridwe antchito:
Chithunzi 3: Kutentha kokwanira kwa RDS(pa) mu mphamvu za MOSFET
- Positive kutentha kokwanira kumalepheretsa kutha kwa kutentha
- Kugawana kwapano kwabwinoko pakugwirira ntchito limodzi
- Kukhazikika kwapamwamba kwamafuta
- Malo ogwiritsira ntchito otetezeka (SOA)
4. Kukana Padziko Lonse
Ma MOSFET amakono amphamvu amapeza kukana kwambiri kwa boma (RDS(pa)), zomwe zimadzetsa zabwino zingapo:
Chithunzi 4: Kusintha kwakale mu MOSFET RDS(pa)
5. Kuthekera kofanana
Ma MOSFET amphamvu amatha kulumikizidwa mosavuta molumikizana kuti agwire mafunde apamwamba, chifukwa cha kutentha kwawo kwabwino:
Chithunzi 5: Kugawana kwapano mu ma MOSFET olumikizidwa ofanana
6. Kukhwima ndi Kudalirika
Ma MOSFET amphamvu amapereka mawonekedwe olimba komanso odalirika:
- Palibe vuto lachiwiri losweka
- Inherent body diode kuteteza reverse voltage
- Kukhoza kwabwino kwambiri kwa avalanche
- Kuthekera kwakukulu kwa dV/dt
Chithunzi 6: Malo Ogwirira Ntchito Otetezedwa (SOA) kuyerekeza pakati pa MOSFET ndi BJT
7. Kugwiritsa Ntchito Ndalama
Ngakhale ma MOSFET amphamvu pawokha atha kukhala ndi mtengo wokwera wokwera poyerekeza ndi ma BJT, mapindu awo amtundu uliwonse nthawi zambiri amabweretsa kuchotsera mtengo:
- Magalimoto osavuta amachepetsa kuchuluka kwa zigawo
- Kuchita bwino kwambiri kumachepetsa zofunikira zoziziritsa
- Kudalirika kwakukulu kumachepetsa ndalama zosamalira
- Kukula kwakung'ono kumathandizira mapangidwe ophatikizika
8. Zochitika Zam'tsogolo ndi Kuwongolera
Ubwino wa mphamvu za MOSFET zikupitilizabe kuyenda bwino ndi kupita patsogolo kwaukadaulo:
Chithunzi 7: Chisinthiko ndi mtsogolo mwaukadaulo wa MOSFET