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LM3478启动失败的问题

Other Parts Discussed in Thread: LM3478, LM3481

采用LM3478设计了一个12V输入24V/3A输出的升压电路,测试中发现:

1. 空载测试,线路全部连接好了之后打开电源,电源电压被拉低到5V,输入电流非常大,看上去像是短路了

2. 把Vin脚断开,先打开电源过几秒再接上Vin,短路消失输出正常

3. 恢复原有电路,将Isense电流检测引脚的阻值从10mR换成30mR,也能正常启动了,带载测试输入45.5W输出35W,转换效率在77%左右。

请问,启动失败是否和输入电压上升太慢有关系,有没有比较好的办法可以避免,保证稳定性和可靠性