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LM5010A输入电压达不到60V?

Other Parts Discussed in Thread: LM5010A

设计要求:

1、LM5010A

2、输入10-60V,输出5V/1A

设计按照Datasheet中的经典电路:

图中C2t采用47uF电解电容,并去掉R3电阻(因C2中有ESR)

 

问题:

输入电压6-46V时,工作正常;但是当输入电压超过46V时,空载正常,不能带负载,带负载后,电压会非常低。