TPS40055的SYNC引脚接的外部555产生的250K频率，多次上电偶尔TPS40055会没电压输出，是什么原因？请问SYNC的频率和TPS40055的上电时序要那个先有？先有频率信号，TPS40055再上电吗？还是其他原因导致的？如果SYNC引脚接地，每次上电都能正常输出。
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