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TPS70933DBV 输入电压24V, 限流10mA芯片烧坏



1,如图输入电压24V, 限流10mA,芯片烧坏 。测试样板10片中有3片烧坏。
2,测得正常芯片第三脚2.5Ⅴ,第五脚3.3V 。不良品第三脚0.06V第五脚1.1V;

不良品如果输入电压24V, 限流10mA, 直接烧坏。测试方法是否得当,帮忙分析下具体原因,谢谢。