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LM27222: 芯片很容易烧毁

Part Number: LM27222

我的电路如图所示,PWM频率100KHz,240KHz和480KHz都试过,当mos管的电源输入为12V时,系统工作正常,但是一旦电压加到24V,驱动管就急速发热,然后就烧掉了,请问这是什么原因?LM27222我换了三个批次的产品了,现象都差不多,问题会在哪儿呢?