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LM2673ADJ发热严重,电压慢慢下降!

Other Parts Discussed in Thread: LMR14030

用LM2673ADJ(TO-263)典型应用搭建了一个5V/3A输出的电源,24V输入。现在5V空载的时候很稳定,小电流(实际测试0.1A)负载也很稳定。不发热。加入负载(0.5A)。开始挺稳定,没过多久就开始发热,电压逐渐下降。用万用变测量电压明显跳变。芯片底部未连接地。这种现象是由于散热做的不够的原因么???还是别的原因????