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LMR33630ADDAEVM: 使用直流源供电,上电后DCDC芯片有大概率烧毁

Part Number: LMR33630ADDAEVM

工程师您好,我在使用LMR33630ADDA设计一个16~20v输入,14.5v/2A输出,预计工作在50℃环境的开关电源。附上原理图与pcb图。使用18V直流源供电,先打开直流源,然后链接gnd,最后连接18V直流电后DCDC芯片烧毁。烧毁后测试得知芯片VIN、VCC、BOOT、SW引脚到gnd都短路了。共焊接8个样品,其中2个样品能正常工作,6个样品烧毁。