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TPS62822: TPS62822 FB resistors

Part Number: TPS62822

Hi Ti,

the tps62822 datasheet page11, 'To keep the fedback net robust from noise,set R2 equal to or lower than 120K to have at least 5uA', but my design the output is 0.6V, the FB PIN is tied to output directly, is the R2 still need? 

And several pcs board,  tps62822 PG is unstable, in our design the Max. current is about 1A,  is there any suggestons for this issue? we can make sure have not overcurrent event, power input 3.3V comes from Server,we use different sever the issue is same。