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CSD18536KTT总是被击穿问题的请教

设计了一个恒流源,电压源部分为DC输入,最大输入电压24V,设计输出电流DC-15A。以四只CSD18536KTT并联作为功率输出,试验中Vds加到12V时电路工作正常,直接加压到24V后CSD18536KTT发热严重,电流加到5、6A左右就会有功率管击穿现象,加大散热无效。电路见PDF文件。请问一下,有什么问题或者改进方法?

3301.恒流板_24V.pdf