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LM2576HV: Input voltage drop on LM2576 with soft-start circuit before

Part Number: LM2576HV
Other Parts Discussed in Thread: LM2596

Hi,

Since I want to solve the inrush current issue on the battery powered system, I connect a soft-start circuit between power supply and LM2576HV , but it shows that the input voltage(24V) will drop to about 6V,

I also tried original LM2576-15V and LM2596 DC to DC product, they all show the same problem on input voltage, how can I fix it?