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TPS40055无法带载启动

Other Parts Discussed in Thread: TPS40055

用TPS40055芯片做了一个电源模块,24V输入,输出17V,6A,先空载启动,然后接上负载,可以正常工作;但是先接上负载,再给电源模块上电,电源模块就起不来了,是什么原因呢?电路参数不论是采用TI官网上的软件工具的计算值还是按照规格书上的计算公式计算,都是无法带载启动。请大家赐教。