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    MOSFET Ӣע-ƽ̨˽ MOSFET Ʒйص

    MOSFET Ѿ˱׼ѡ㷺ѹ <200VģʽԴ SMPSתӦõ ȻṩֲΪض·ѡ ʵȴԽԽӢע-ƽ̨MOSFET Ҫѡͱ׼ MOSFET йصĹ SMPS Чйأ MOSFET Ĺ װ߽ºйأ Ӧָص MOSFET ĻԺ֪ʶ мӰ MOSFET դڽ MOSFET ֮ǰбҪ˽ṹĻ֪ʶӢע-ƽ̨Ӧָ ϸ˹ MOSFET ṹĻṹȷ˼ ԪӢע-ƽ̨Ӣע-ƽ̨ԼΪλ ھиٶصѹӢע-ƽ̨ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETӢע-ƽ̨ijЩԵͨ裨RDS(on)Ϊ Ӣע-ƽ̨˲̬͵ѹεĿĻ դйصΪӢע-ƽ̨֤ (1)(2) ҲҪ
    MOSFET ѡõƷ
    ̻涨˲̬ͬͶ̬µ MOSFET ڽͬƷԱӶø Ψһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡ мַ߶ԱضӦõ MOSFET ȻʱʵһַǸƷ MOSFETӢע-ƽ̨򵥵ʽӢע-ƽ̨Ʒڸ RDS(on) ±Ƚդ Qg˻ijй ܹʵ RDS(on) QgȻRDS(on) Խդ ԽƵԱȷΪ “Baliga ƵƷ” - BHFFOM(1)Ҫ Ciss /  ʹ “ Ƶ Ʒ ” - NHFFOM(2)Ӣע-ƽ̨Ҫ Coss / ŵ 2 ַҪʵ MOSFET Ӧ ȻӢע-ƽ̨ЩֻͬƷԱӢע-ƽ̨û޷ ȷijһƷǷһȾһƷ IJͬ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾijЩӦӢע-ƽ̨ Si4888DY Si4842DYDzøͼ - ˸ӵƷͼ - ͹۵ȷ Ӧõ
    ͼ 1 - Vishay Siliconix N-  30V SO-8 MOSFET  ͼƷ
    MOSFET ṹ MOSFET ͹ MOSFET ļһ㶨 1 ʾ
    MOSFET ṹ
    κι MOSFET ĻԴڴ DMOS Ӣע-ƽ̨ ԴĵűӢע-ƽ̨ȻתŴֱ ɢ֮ıӢע-ƽ̨©Ƭ ľԲӢע-ƽ̨ƽڶྦྷդγɹӢע-ƽ̨ȻӢע-ƽ̨Ӣע-ƽ̨ ۽ṹӢע-ƽ̨ƽṹĵԪܶΪڳߵԪ ܶӢע-ƽ̨ JFET жЧӦ (1) ͨ 뼸޷֤ƽ DMOS Ԫ ܶȽһߵ 3000 Ԫ / ƽӢһ ֻܽжЧӦͨٵԪ MOSFET ͨ
    Ϊ˿˷ƽж Vishay Siliconix ʵ ˹դֱ MOSFET TrenchFETر浼  TrenchFET ͨʴоƬĹ۲ڴֱγɵĹ  DMOS ͼ 2 ʾƽ DMOS յԪģʽγһƹ赺դӢע-ƽ̨ÿ赺 ˫ɢͷԴɢĵط ۱ȻõӢע-ƽ̨չƽγդ ۼӢע-ƽ̨ڲJFETжЧӦ ߵԪܶͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺͿԴһ ϵܹⳬ͵ͨդԺͳɱȻ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪӢע-ƽ̨صҪں ʹֱԪչŻ RDS(on)Ż դӢע-ƽ̨ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸Ӷǿ˿ٿ Ƶ >400kHzDzɻȱӢע-ƽ̨ դijӰϵͳЧʵҪӢע-ƽ̨Ա 뿼դ ͨƴֱչ˵Ӣע-ƽ̨ RDS(on)x Qg ֵ 100 m Ω x nC
     DMOS 3D صԪ
      DMOS 3D صԪ
    DMOSMOSFETĵͨǻӱĸ ĵ֮ ͼ 2 ʾӢע-ƽ̨

    ӦעӢע-ƽ̨ƽ MOSFET RRDS(on) ֵ JFET ԪӢע-ƽ̨ MOSFET ļ N-MOSFETļͼͼ4ʾӢע-ƽ̨Cgd Cds CgsЩֵԼӢע-ƽ̨ ݺͷ 1 Ӣע-ƽ̨
    ͼ 4 - N  MOSFET ļ򻯵Ч· мӢע-ƽ̨ npn  ܺ Rb 裩
    ͼ 5 - դ©©Դѹϵͼ
    ȻӦעڵЧ· 1 3 ҪӵöЩֻ˽⿪ ˲̬ դ© Cgd դԴ Cgs ѹӢע-ƽ̨˵ ֵʩ©ԴդԴϵĵѹCgdı仯 Cgs öֻΪʩӵĵѹ Cgs ϵĴ öCgd ı仯 (1) ͼ 5 ʾܸߴ 100 ͨ 2 ֵ̬Ӣע-ƽ̨Щݱ仯Ӱʩդϵ ѹӢע-ƽ̨Ӷγƽ̨ (1)Ӣע-ƽ̨ڷ˲̬ʱ ͽͨ½ʱ “ƽ”դѹͼ 6 ʾӢע-ƽ̨
     6- դ©©Դѹϵͼ
    ӦָһϵнڿģʽԴʵֵĹ MOSFET Ļ빤ܵļĵеĵһ Ӧָּȫ Vishay Siliconix MOSFETs õ FOM õԴѡȴͿʵֵӢע-ƽ̨Ҫпɿ۷ ÿ FOMӢע-ƽ̨Ӣע-ƽ̨Ա MOSFET Ӧ÷ϢӢע-ƽ̨Ӣע-ƽ̨ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1Ӣע-ƽ̨
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