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      MOSFET Ӣֱ-ֱ-funֱ˽ MOSFET Ʒйص

      MOSFET Ѿ˱׼ѡ㷺ѹ <200VģʽԴ SMPSתӦõ ȻṩֲΪض·ѡ ʵȴԽԽӢֱ-ֱ-funֱMOSFET Ҫѡͱ׼ MOSFET йصĹ SMPS Чйأ MOSFET Ĺ װ߽ºйأ Ӧָص MOSFET ĻԺ֪ʶ мӰ MOSFET դڽ MOSFET ֮ǰбҪ˽ṹĻ֪ʶӢֱ-ֱ-funֱӦָ ϸ˹ MOSFET ṹĻṹȷ˼ ԪӢֱ-ֱ-funֱӢֱ-ֱ-funֱԼΪλ ھиٶصѹӢֱ-ֱ-funֱ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETӢֱ-ֱ-funֱijЩԵͨ裨RDS(on)Ϊ Ӣֱ-ֱ-funֱ˲̬͵ѹεĿĻ դйصΪӢֱ-ֱ-funֱ֤ (1)(2) ҲҪ
      MOSFET ѡõƷ
      ̻涨˲̬ͬͶ̬µ MOSFET ڽͬƷԱӶø Ψһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡ мַ߶ԱضӦõ MOSFET ȻʱʵһַǸƷ MOSFETӢֱ-ֱ-funֱ򵥵ʽӢֱ-ֱ-funֱƷڸ RDS(on) ±Ƚդ Qg˻ijй ܹʵ RDS(on) QgȻRDS(on) Խդ ԽƵԱȷΪ “Baliga ƵƷ” - BHFFOM(1)Ҫ Ciss /  ʹ “ Ƶ Ʒ ” - NHFFOM(2)Ӣֱ-ֱ-funֱҪ Coss / ŵ 2 ַҪʵ MOSFET Ӧ ȻӢֱ-ֱ-funֱЩֻͬƷԱӢֱ-ֱ-funֱû޷ ȷijһƷǷһȾһƷ IJͬ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾijЩӦӢֱ-ֱ-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 Ӣֱ-ֱ-funֱ ԴĵűӢֱ-ֱ-funֱȻתŴֱ ɢ֮ıӢֱ-ֱ-funֱ©Ƭ ľԲӢֱ-ֱ-funֱƽڶྦྷդγɹӢֱ-ֱ-funֱȻӢֱ-ֱ-funֱӢֱ-ֱ-funֱ ۽ṹӢֱ-ֱ-funֱƽṹĵԪܶΪڳߵԪ ܶӢֱ-ֱ-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դӢֱ-ֱ-funֱÿ赺 ˫ɢͷԴɢĵط ۱ȻõӢֱ-ֱ-funֱչƽγդ ۼӢֱ-ֱ-funֱڲJFETжЧӦ ߵԪܶͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺͿԴһ ϵܹⳬ͵ͨդԺͳɱȻ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪӢֱ-ֱ-funֱصҪں ʹֱԪչŻ RDS(on)Ż դӢֱ-ֱ-funֱ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸Ӷǿ˿ٿ Ƶ >400kHzDzɻȱӢֱ-ֱ-funֱ դijӰϵͳЧʵҪӢֱ-ֱ-funֱԱ 뿼դ ͨƴֱչ˵Ӣֱ-ֱ-funֱ RDS(on)x Qg ֵ 100 m Ω x nC
       DMOS 3D صԪ
        DMOS 3D صԪ
      DMOSMOSFETĵͨǻӱĸ ĵ֮ ͼ 2 ʾӢֱ-ֱ-funֱ

      ӦעӢֱ-ֱ-funֱƽ MOSFET RRDS(on) ֵ JFET ԪӢֱ-ֱ-funֱ MOSFET ļ N-MOSFETļͼͼ4ʾӢֱ-ֱ-funֱCgd Cds CgsЩֵԼӢֱ-ֱ-funֱ ݺͷ 1 Ӣֱ-ֱ-funֱ
      ͼ 4 - N  MOSFET ļ򻯵Ч· мӢֱ-ֱ-funֱ npn  ܺ Rb 裩
      ͼ 5 - դ©©Դѹϵͼ
      ȻӦעڵЧ· 1 3 ҪӵöЩֻ˽⿪ ˲̬ դ© Cgd դԴ Cgs ѹӢֱ-ֱ-funֱ˵ ֵʩ©ԴդԴϵĵѹCgdı仯 Cgs öֻΪʩӵĵѹ Cgs ϵĴ öCgd ı仯 (1) ͼ 5 ʾܸߴ 100 ͨ 2 ֵ̬Ӣֱ-ֱ-funֱЩݱ仯Ӱʩդϵ ѹӢֱ-ֱ-funֱӶγƽ̨ (1)Ӣֱ-ֱ-funֱڷ˲̬ʱ ͽͨ½ʱ “ƽ”դѹͼ 6 ʾӢֱ-ֱ-funֱ
       6- դ©©Դѹϵͼ
      ӦָһϵнڿģʽԴʵֵĹ MOSFET Ļ빤ܵļĵеĵһ Ӧָּȫ Vishay Siliconix MOSFETs õ FOM õԴѡȴͿʵֵӢֱ-ֱ-funֱҪпɿ۷ ÿ FOMӢֱ-ֱ-funֱӢֱ-ֱ-funֱԱ MOSFET Ӧ÷ϢӢֱ-ֱ-funֱӢֱ-ֱ-funֱ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1Ӣֱ-ֱ-funֱ
        ֤: ҸͼƬ
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           ߣ021-58979561
           ҵѯqq447495955
           ҵѯqq1852433657
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           ֧qq313548578
           Ⱥ376450741
           ҵѯ:  ҷϢ
           ҵѯ:  ҷϢ
           ҵѯ:  ҷϢ
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        Ӣֱ-ֱ-funֱ

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