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        MOSFET ʿֱ-ֱ-funֱ˽ MOSFET Ʒйص

        MOSFET Ѿ˱׼ѡ㷺ѹ <200VģʽԴ SMPSתӦõ ȻṩֲΪض·ѡ ʵȴԽԽʿֱ-ֱ-funֱMOSFET Ҫѡͱ׼ MOSFET йصĹ SMPS Чйأ MOSFET Ĺ װ߽ºйأ Ӧָص MOSFET ĻԺ֪ʶ мӰ MOSFET դڽ MOSFET ֮ǰбҪ˽ṹĻ֪ʶʿֱ-ֱ-funֱӦָ ϸ˹ MOSFET ṹĻṹȷ˼ Ԫʿֱ-ֱ-funֱʿֱ-ֱ-funֱԼΪλ ھиٶصѹʿֱ-ֱ-funֱ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETʿֱ-ֱ-funֱijЩԵͨ裨RDS(on)Ϊ ʿֱ-ֱ-funֱ˲̬͵ѹεĿĻ դйصΪʿֱ-ֱ-funֱ֤ (1)(2) ҲҪ
        MOSFET ѡõƷ
        ̻涨˲̬ͬͶ̬µ MOSFET ڽͬƷԱӶø Ψһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡ мַ߶ԱضӦõ MOSFET ȻʱʵһַǸƷ MOSFETʿֱ-ֱ-funֱ򵥵ʽʿֱ-ֱ-funֱƷڸ RDS(on) ±Ƚդ Qg˻ijй ܹʵ RDS(on) QgȻRDS(on) Խդ ԽƵԱȷΪ “Baliga ƵƷ” - BHFFOM(1)Ҫ Ciss /  ʹ “ Ƶ Ʒ ” - NHFFOM(2)ʿֱ-ֱ-funֱҪ Coss / ŵ 2 ַҪʵ MOSFET Ӧ Ȼʿֱ-ֱ-funֱЩֻͬƷԱʿֱ-ֱ-funֱû޷ ȷijһƷǷһȾһƷ IJͬ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾijЩӦʿֱ-ֱ-funֱ 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 ʿֱ-ֱ-funֱ Դĵűʿֱ-ֱ-funֱȻתŴֱ ɢ֮ıʿֱ-ֱ-funֱ©Ƭ ľԲʿֱ-ֱ-funֱƽڶྦྷդγɹʿֱ-ֱ-funֱȻʿֱ-ֱ-funֱʿֱ-ֱ-funֱ ۽ṹʿֱ-ֱ-funֱƽṹĵԪܶΪڳߵԪ ܶʿֱ-ֱ-funֱ 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դʿֱ-ֱ-funֱÿ赺 ˫ɢͷԴɢĵط ۱Ȼõʿֱ-ֱ-funֱչƽγդ ۼʿֱ-ֱ-funֱڲJFETжЧӦ ߵԪܶͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺͿԴһ ϵܹⳬ͵ͨդԺͳɱȻ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪʿֱ-ֱ-funֱصҪں ʹֱԪչŻ RDS(on)Ż դʿֱ-ֱ-funֱ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸Ӷǿ˿ٿ Ƶ >400kHzDzɻȱʿֱ-ֱ-funֱ դijӰϵͳЧʵҪʿֱ-ֱ-funֱԱ 뿼դ ͨƴֱչ˵ʿֱ-ֱ-funֱ RDS(on)x Qg ֵ 100 m Ω x nC
         DMOS 3D صԪ
          DMOS 3D صԪ
        DMOSMOSFETĵͨǻӱĸ ĵ֮ ͼ 2 ʾʿֱ-ֱ-funֱ

        Ӧעʿֱ-ֱ-funֱƽ MOSFET RRDS(on) ֵ JFET Ԫʿֱ-ֱ-funֱ MOSFET ļ N-MOSFETļͼͼ4ʾʿֱ-ֱ-funֱCgd Cds CgsЩֵԼʿֱ-ֱ-funֱ ݺͷ 1 ʿֱ-ֱ-funֱ
        ͼ 4 - N  MOSFET ļ򻯵Ч· мʿֱ-ֱ-funֱ npn  ܺ Rb 裩
        ͼ 5 - դ©©Դѹϵͼ
        ȻӦעڵЧ· 1 3 ҪӵöЩֻ˽⿪ ˲̬ դ© Cgd դԴ Cgs ѹʿֱ-ֱ-funֱ˵ ֵʩ©ԴդԴϵĵѹCgdı仯 Cgs öֻΪʩӵĵѹ Cgs ϵĴ öCgd ı仯 (1) ͼ 5 ʾܸߴ 100 ͨ 2 ֵ̬ʿֱ-ֱ-funֱЩݱ仯Ӱʩդϵ ѹʿֱ-ֱ-funֱӶγƽ̨ (1)ʿֱ-ֱ-funֱڷ˲̬ʱ ͽͨ½ʱ “ƽ”դѹͼ 6 ʾʿֱ-ֱ-funֱ
         6- դ©©Դѹϵͼ
        ӦָһϵнڿģʽԴʵֵĹ MOSFET Ļ빤ܵļĵеĵһ Ӧָּȫ Vishay Siliconix MOSFETs õ FOM õԴѡȴͿʵֵʿֱ-ֱ-funֱҪпɿ۷ ÿ FOMʿֱ-ֱ-funֱʿֱ-ֱ-funֱԱ MOSFET Ӧ÷Ϣʿֱ-ֱ-funֱʿֱ-ֱ-funֱ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1ʿֱ-ֱ-funֱ
          ֤: ҸͼƬ
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             Ⱥ376450741
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          ʿֱ-ֱ-funֱ
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