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LM5160: Secondary output is not stable, It is decreasing drastically with respect to Load current. Switching frequency is also not constant.

Part Number: LM5160

---my circuit---

Input=6V at HV6, Output=5V at P5.0V

my schematic

Why is Output voltage as LM5160 weak and unstable in my circuit?

What modifications are needed to achieve the desired output with good voltage regulation?

Frequency is also unstable

Please give me advise.

Best regard

K. Harish