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LM5117 jitter issue in light load mode

Other Parts Discussed in Thread: LM5117

Dear Sir 

SPEC is 48Vin to 8Vout/4A

Schematic as below 

We find LM5117 is unstable within Iout=0.9A~1.9A ,when up to 2A~4A ,LM5117 switching node is stable ,

As we change Rramp for 120K to 65K ,the jitter can be improved ,but in Iout=1.6~1.65A LM5117 is still unstable

Please kindly help to provide suggestion

PS.CP5 had already change to 0.47uF

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