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这也是为什么很多TOP-03封装的二极管号称能通过多大多大的电流,如果没有散热片的话,很可能一半的电流就OVER了。
that is due to limitations on power dissipation. most silicon rectifiers have a forward voltage drop (Vf) of about 1v. at 20amp Ifav, the average power dissipated on the bridge is 20w. so if you don't have a sizeable heatsink, you will burn your bridge in no time.
here is a chart, again, from gbpc's datasheet.
as you can see, the Ifav needs to be derated quite substantially as the case temperature goes up. |
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