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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˽ṹĻ֪ʶӦָ ϸ˹ MOSFET ṹĻṹȷ˼ ԪԼΪλ ھиٶصѹ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETijЩԵͨ裨RDS(on)Ϊ ˲̬͵ѹεĿĻ դйصΪ֤ (1)(2) ҲҪ
          MOSFET ѡõƷ
          ̻涨˲̬ͬͶ̬µ MOSFET ڽͬƷԱӶø Ψһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡ мַ߶ԱضӦõ MOSFET ȻʱʵһַǸƷ MOSFET򵥵ʽƷڸ RDS(on) ±Ƚդ Qg˻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 ȻЩֻͬƷԱû޷ ȷijһƷǷһȾһƷ IJͬ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾijЩӦ 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  ԴĵűȻתŴֱ ɢ֮ı©Ƭ ľԲƽڶྦྷդγɹȻ ۽ṹƽṹĵԪܶΪڳߵԪ ܶ 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դÿ赺 ˫ɢͷԴɢĵط ۱Ȼõչƽγդ ۼڲJFETжЧӦ ߵԪܶͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺͿԴһ ϵܹⳬ͵ͨդԺͳɱȻ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪصҪں ʹֱԪչŻ RDS(on)Ż դ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸Ӷǿ˿ٿ Ƶ >400kHzDzɻȱ դijӰϵͳЧʵҪԱ 뿼դ ͨƴֱչ˵ RDS(on)x Qg ֵ 100 m Ω x nC
           DMOS 3D صԪ
            DMOS 3D صԪ
          DMOSMOSFETĵͨǻӱĸ ĵ֮ ͼ 2 ʾ

          Ӧעƽ MOSFET RRDS(on) ֵ JFET Ԫ MOSFET ļ N-MOSFETļͼͼ4ʾCgd Cds CgsЩֵԼ 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©ԴդԴϵĵѹCgdı仯 Cgs öֻΪʩӵĵѹ Cgs ϵĴ öCgd ı仯 (1) ͼ 5 ʾܸߴ 100 ͨ 2 ֵ̬Щݱ仯Ӱʩդϵ ѹӶγƽ̨ (1)ڷ˲̬ʱ ͽͨ½ʱ “ƽ”դѹͼ 6 ʾ
           6- դ©©Դѹϵͼ
          ӦָһϵнڿģʽԴʵֵĹ MOSFET Ļ빤ܵļĵеĵһ Ӧָּȫ Vishay Siliconix MOSFETs õ FOM õԴѡȴͿʵֵҪпɿ۷ ÿ FOMԱ MOSFET Ӧ÷Ϣ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1
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