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关于DSP6678加电,电流不正常的问题

Other Parts Discussed in Thread: TPS56221

问题描述:自己设计一款DSP+FPGA板卡,DSP通过TPS56221 和4644供电,输入电压是12V,DSP上电顺序是由FPGA控制,现在按照加电顺序上电后,电源电压输出均正常,问题是电流一直在增加,是1mA的样子往上长。摸DSP芯片就很热,有一个问题就是,当用风扇吹时,电流是1mA的往下降?!!

 DSP 6678没有加散热片,这是什么原因???!!!