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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˼ Ԫ|¼|ٷ|/ҳ|¼|ٷ|/ҳԼΪλ ھиٶصѹ|¼|ٷ|/ҳ ԲȷܹڽϿĵ·Χʵ ͨ MOSFETijЩԵͨ裨RDS(on)Ϊ ˲̬͵ѹεĿĻ դйصΪ|¼|ٷ|/ҳ֤ (1)(2) ҲҪ|¼|ٷ|/ҳ
MOSFET ѡõƷ
̻涨˲̬ͬͶ̬µ MOSFET ڽͬƷԱӶø Ψһȷѡʵ MOSFET ķ MOSFET Ӧõ·ڱȽѡ мַ߶ԱضӦõ MOSFET|¼|ٷ|/ҳ Ȼʱʵ|¼|ٷ|/ҳһַǸƷ MOSFET򵥵ʽƷڸ RDS(on) ±Ƚդ Qg˻ijй ܹʵ RDS(on) QgȻ|¼|ٷ|/ҳRDS(on) Խ|¼|ٷ|/ҳդ ԽƵԱȷΪ “Baliga ƵƷ” - BHFFOM(1)Ҫ Ciss /  ʹ “ Ƶ Ʒ ” - NHFFOM(2)Ҫ Coss / ŵ 2 ַҪʵ MOSFET Ӧ|¼|ٷ|/ҳ ȻЩֻͬƷԱ|¼|ٷ|/ҳû޷ ȷijһƷǷһȾһƷ IJͬ|¼|ٷ|/ҳ Vishay Siliconix ϵ 30V SO-8 N- MOSFET ƷƷ Qg x RDS(on) ͼ 1 ʾ|¼|ٷ|/ҳijЩӦ Si4888DY Si4842DYDzøͼ - ˸ӵƷͼ - ͹۵ȷ Ӧõ
ͼ 1 - Vishay Siliconix N-  30V SO-8 MOSFET  ͼƷ
MOSFET ṹ MOSFET ͹ MOSFET ļһ㶨 1 ʾ|¼|ٷ|/ҳ
MOSFET ṹ
κι MOSFET ĻԴڴ DMOS  ԴĵűȻתŴֱ ɢ֮ı|¼|ٷ|/ҳ©Ƭ ľԲ|¼|ٷ|/ҳƽڶྦྷդγɹȻ ۽ṹ|¼|ٷ|/ҳƽṹĵԪܶ|¼|ٷ|/ҳΪڳߵԪ ܶ|¼|ٷ|/ҳ JFET жЧӦ (1) ͨ|¼|ٷ|/ҳ 뼸޷֤ƽ DMOS Ԫ ܶȽһߵ 3000 Ԫ / ƽӢһ ֻܽжЧӦ|¼|ٷ|/ҳͨٵԪ MOSFET ͨ|¼|ٷ|/ҳ
Ϊ˿˷ƽж Vishay Siliconix ʵ ˹դֱ MOSFET TrenchFETر浼  TrenchFET ͨʴоƬĹ۲ڴֱγɵĹ  DMOS ͼ 2 ʾƽ DMOS յԪģʽγһƹ赺դÿ赺 ˫ɢͷԴɢĵط|¼|ٷ|/ҳ ۱Ȼõ|¼|ٷ|/ҳչƽγդ ۼ|¼|ٷ|/ҳڲJFETжЧӦ ߵԪܶ|¼|ٷ|/ҳͬʵָߵԪܶ >2 ڵԪ / ƽӢ 磩ߵõԪܶˮƽǺ|¼|ٷ|/ҳͿԴһ ϵܹⳬ͵ͨ|¼|ٷ|/ҳ|¼|ٷ|/ҳդԺͳɱȻ λԲϾƬӣ߳ɱƣ RDS(on) ܣȻ 2  ܶΪ 1.78 ڵԪ / ƽӢ MOSFET ۾Ƭĺ ͼ 3 ʾⲿִڵijܶȾԲչʾ˸ ܶȵԪչΪʵֵԪ|¼|ٷ|/ҳصҪں ʹֱԪչ|¼|ٷ|/ҳŻ RDS(on)|¼|ٷ|/ҳŻ դ ߵԪܶȵĺչķչص ͼ 3b ʾõ˸|¼|ٷ|/ҳӶǿ˿ٿ|¼|ٷ|/ҳ Ƶ >400kHzDzɻȱ |¼|ٷ|/ҳդijӰϵͳЧʵҪԱ 뿼դ ͨƴֱչ˵ RDS(on)x Qg ֵ 100 m Ω x nC|¼|ٷ|/ҳ
 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 |¼|ٷ|/ҳ
ͼ 4 - N  MOSFET ļ򻯵Ч· м npn  ܺ Rb 裩
ͼ 5 - դ©©Դѹϵͼ
Ȼ|¼|ٷ|/ҳӦע|¼|ٷ|/ҳڵЧ· 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|¼|ٷ|/ҳ FOM õԴѡȴͿʵֵҪпɿ۷ ÿ FOM|¼|ٷ|/ҳԱ MOSFET Ӧ÷Ϣ|¼|ٷ|/ҳ Ӧָ϶ΪضӦѡʵʱҪǵ Ҫ 1
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