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TPS40170: TPS

Part Number: TPS40170

大佬们请教下问题:48V转12V的TPS的芯片,会出现芯片寄了的情况(频繁开关机100次(间隔2S开关机一次)),但是芯片的VDD和LDO有输出,但是驱动没波形啥情况,如何改进电路,另外官方的计算工具 

WEBENCH Tools 计算的电路准确嘛?  环路稳定性有何影响,怎么重新计算