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TPS562200 使用问题

Other Parts Discussed in Thread: TPS562200

请教个问题,TPS562200,按照datasheet上的推荐的电路图连接,目前测试时,空载都正常;带上负载后,5V输入正常,8V输入时,纹波大,DCDC开关频率变得不稳定,芯片发烫,12V输入时芯片直接烧掉,负载不超过500mA,不知道是什么问题。