External clock have below discription in datasheet.
When external frequency equal internal one.
LTC3417 output is unstable .
When External frequency up to +20% from internal frequency,
IC output is stable.
What operation is occured in IC?
How much % can we use for RT?(Do external frequency +40% ,+60% from internal them have correct operation?)
Because RT resistor have some dispersion.
Thank you very much
RT set oscillator frequency should be 20% lower than external clock means the External SYNC signal should be 25% higher than the RT frequency.