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在附有散热片的情况下,使用结点对环境的热阻(Rth(j-cf)+Rth(cf-a))计算半导体器件的允许结点温度。(Rth(j-cf)+Rth(cf-a))。
(Tj-Ta)=(Rth(j-cf) + Rth(cf-a))×P
选择散热片热阻时,应确保半导体器件的结点温度在允许值范围内。
Rth(cf-a)=((Tj - Ta) / P)- Rth(j-cf)
例如,Tj=120[deg.C],Ta=50[deg.C],P=10[W],Rth(j-cf) =0.5[deg.C/W](若忽略半导体器件和散热片之间的接触电阻)
Rth(cf-a)=6.5[deg.C/W]
使用热阻值低于6.5℃/W的散热片,可以获得预期的结果。