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TPS61096A在使用时容易烧坏

TPS61096A,供电3.7V锂电池,LV1接3V大约40多KHz的PWM信号。LV2悬空,SW通过一个2.2uH电感接VIN。ILIM接VIN,EN接VIN,VOSNS和FB之间的电阻为200K,FB对地电阻为10K。VOUT对地电容2.2uF。HVO2悬空,HVO1接输出焊盘
PWM信号不接入,TPS61096VOUT正常输出。PWM信号接入几十秒后,TPS61096A短路损坏了,电源和地之间电阻为2欧。