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Slience
Level 2
Level 2
First solution authored 25 sign-ins 5 replies posted

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根据以上公式,Ptot(25C)=(175-25)/0.24=625W;   Ptot(100C)=(175-100)/0.24=312.5W; 与规格书中的612W和307W对应不上。

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1 Solution
Rachel_G
Moderator
Moderator
Moderator
50 likes received 250 solutions authored 250 replies posted

您好,

根据计算得出的625W与DS中的621W,312.5W与307W,是在合理的计算误差范围内,主要是Rth(j-c)的值很小,会影响计算误差。您也可以尝试将公式反推,用621W计算Rth(j-c)的值,得到的Rth(j-c)约等于0.2415,相比于0.24都是在合理的误差范围内的。

该值只是作为应用设计中的参考值,最终还是要以实际应用条件下的测试值为准。

谢谢!

Rachel

 

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3 Replies
Rachel_G
Moderator
Moderator
Moderator
50 likes received 250 solutions authored 250 replies posted

您好,

根据计算得出的625W与DS中的621W,312.5W与307W,是在合理的计算误差范围内,主要是Rth(j-c)的值很小,会影响计算误差。您也可以尝试将公式反推,用621W计算Rth(j-c)的值,得到的Rth(j-c)约等于0.2415,相比于0.24都是在合理的误差范围内的。

该值只是作为应用设计中的参考值,最终还是要以实际应用条件下的测试值为准。

谢谢!

Rachel

 

Slience
Level 2
Level 2
First solution authored 25 sign-ins 5 replies posted

好的,感谢您的解答!可以帮我看下Ic vc Tc曲线的绘制的问题吗?😁

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Rachel_G
Moderator
Moderator
Moderator
50 likes received 250 solutions authored 250 replies posted

不客气,已经回复好了😃

Rachel

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