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TPS61027: TPS61027DRCR 工作温度过高

Part Number: TPS61027
Other Parts Discussed in Thread: TPS63060

用6V供电输出5V,降压时带540mA的负载电流,芯片的温度我们测试达到54度之上,芯片自身很烫,并且环境温度在25度左右。看规格书曲线,在这个支持范围。     负载200MA 就不会,是不是选错型号? 如果是请推荐。