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    MOSFET ˽ MOSFET Ʒйص

    MOSFET Ѿ˱׼ѡ㷺ѹ <200VģʽԴ SMPSתӦõ ȻṩֲΪض·ѡ ʵȴԽԽMOSFET Ҫѡͱ׼ MOSFET йصĹ SMPS Чйأ MOSFET Ĺ װ߽ºйأ Ӧָص MOSFET ĻԺ֪ʶ мӰ MOSFET դڽ MOSFET ֮ǰбҪ˽ṹĻ֪ʶڰֱnba߹ۿط-ڰֱnbaؿӦָ ϸ˹ MOSFET ṹĻṹȷ˼ ԪԼΪλ ھиٶصѹ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETijЩԵͨ裨RDS(on)Ϊ ˲̬͵ѹεĿĻ դйصΪ֤ (1)(2) ҲҪĺڰֱnba߹ۿط-ڰֱnbaؿ
    MOSFET ѡõƷ
    ̻涨˲̬ͬͶ̬µ MOSFET ڰֱnba߹ۿط-ڰֱnbaؿڽͬƷԱӶø ˺ڰֱnba߹ۿط-ڰֱnbaؿΨһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡڰֱnba߹ۿط-ڰֱnbaؿ мַ߶ԱضӦõ MOSFET ȻʱʵһַǸƷ MOSFETڰֱnba߹ۿط-ڰֱnbaؿ򵥵ʽƷڸ RDS(on) ±Ƚդ Qgڰֱnba߹ۿط-ڰֱnbaؿ˻ijй ܹʵ RDS(on) QgȻRDS(on) Խդ ԽƵԱȷΪ “Baliga ƵƷ” - BHFFOM(1)Ҫ Ciss /  ʹ “ Ƶ Ʒ ” - NHFFOM(2)Ҫ Coss / ŵ 2 ַҪʵ MOSFET Ӧ Ȼڰֱnba߹ۿط-ڰֱnbaؿЩֻͬƷԱû޷ ȷijһƷǷһȾһƷ IJͬ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾڰֱnba߹ۿط-ڰֱnbaؿڰֱnba߹ۿط-ڰֱnbaؿڰֱnba߹ۿط-ڰֱnbaؿijЩӦ Si4888DY Si4842DYDzøͼ - ˸ӵƷͼ - ͹۵ȷ Ӧõ
    ͼ 1 - Vishay Siliconix N-  30V SO-8 MOSFET  ͼƷ
    MOSFET ṹ MOSFET ͹ MOSFET ļһ㶨 1 ʾڰֱnba߹ۿط-ڰֱnbaؿ
    MOSFET ṹ
    κι MOSFET ĻԴڴ DMOS  ԴĵűȻתŴֱ ɢ֮ı©ڰֱnba߹ۿط-ڰֱnbaؿƬ ľԲڰֱnba߹ۿط-ڰֱnbaؿƽڶྦྷդγɹȻ ۽ṹƽṹĵԪܶڰֱnba߹ۿط-ڰֱnbaؿΪڳߵԪ ܶºڰֱnba߹ۿط-ڰֱnbaؿ JFET жЧӦ (1) ͨڰֱnba߹ۿط-ڰֱnbaؿ 뼸ڰֱnba߹ۿط-ڰֱnbaؿ޷֤ƽ DMOS Ԫ ܶȽһߵ 3000 Ԫ / ƽӢһ ܽܺڰֱnba߹ۿط-ڰֱnbaؿֻжЧӦͨٵԪ MOSFET ͨ
    Ϊ˿˷ƽжڰֱnba߹ۿط-ڰֱnbaؿ Vishay Siliconix ʵ ˹դֱ MOSFET TrenchFETر浼 ڰֱnba߹ۿط-ڰֱnbaؿ TrenchFET ͨʴоƬĹ۲ڴֱγɵĹ  DMOS ͼ 2 ʾƽ DMOS յԪģʽγһƹ赺դÿ赺 ˫ɢͷԴɢĵط ۱Ȼõչƽγդ ۼڰֱnba߹ۿط-ڰֱnbaؿڲJFETжЧӦ ߵԪܶͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺڰֱnba߹ۿط-ڰֱnbaؿͿԴһ ϵܹⳬ͵ͨڰֱnba߹ۿط-ڰֱnbaؿդԺͳɱȻڰֱnba߹ۿط-ڰֱnbaؿڰֱnba߹ۿط-ڰֱnbaؿ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪصҪں ʹֱԪչϺڰֱnba߹ۿط-ڰֱnbaؿŻ RDS(on)Ż դԺڰֱnba߹ۿط-ڰֱnbaؿ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸Ӷǿ˿ٿغڰֱnba߹ۿط-ڰֱnbaؿ Ƶ >400kHzDzɻȱڰֱnba߹ۿط-ڰֱnbaؿ դijӰϵͳЧʵҪڰֱnba߹ۿط-ڰֱnbaؿԱ 뿼դ ͨƴֱչڰֱnba߹ۿط-ڰֱnbaؿ˵ڰֱnba߹ۿط-ڰֱnbaؿ RDS(on)x Qg ֵ 100 m Ω x nCڰֱnba߹ۿط-ڰֱnbaؿ
     DMOS 3D صԪ
      DMOS 3D صԪ
    DMOSMOSFETĵͨǻӱĸ ĵ֮ ͼ 2 ʾڰֱnba߹ۿط-ڰֱnbaؿ

    Ӧעƽ MOSFET RRDS(on) ֵ JFET Ԫ MOSFET ļ N-MOSFETļͼͼ4ʾCgd Cds Cgsڰֱnba߹ۿط-ڰֱnbaؿЩֵԼ ݺͷ 1 
    ͼ 4 - N  MOSFET ļ򻯵Ч· м npn  ܺ Rb 裩
    ͼ 5 - դ©©Դѹϵͼ
    ȻӦעڵЧ· 1 3 ҪӵöЩֻ˽⿪ ˲̬ դ© Cgd դԴ Cgs ѹ˵ ֵʩ©ԴդԴϵĵѹڰֱnba߹ۿط-ڰֱnbaؿڰֱnba߹ۿط-ڰֱnbaؿCgdı仯 Cgs öֻΪʩӵĵѹ Cgs ϵĴ öCgd ı仯 (1) ͼ 5 ʾܸߴ 100 ڰֱnba߹ۿط-ڰֱnbaؿͨ 2 ֵ̬Щݱ仯Ӱʩդϵ ѹڰֱnba߹ۿط-ڰֱnbaؿӶγƽ̨ (1)ڷ˲̬ʱ ͽͨ½ʱ “ƽ”դѹڰֱnba߹ۿط-ڰֱnbaؿͼ 6 ʾڰֱnba߹ۿط-ڰֱnbaؿ
     6- դ©©Դѹϵͼ
    ӦָһϵнڿģʽԴʵֵĹ MOSFET Ļ빤ܵļĵеĵһڰֱnba߹ۿط-ڰֱnbaؿ Ӧָּȫ Vishay Siliconix MOSFETs õ FOM õԴѡȴͿʵֵҪпɿ۷ڰֱnba߹ۿط-ڰֱnbaؿ ÿ FOMԱ MOSFET Ӧ÷Ϣ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1
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