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用tps40057做电源不能驱动直流电机

Other Parts Discussed in Thread: TPS40057

用tps40057做8v输出5a电源,用电子负载测试可以带载启,但是不能在工作度时候开负载,0.5A也不行,否者电源重启。如果接电机,就不断重启(值mos驱动脉冲),何解?