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TPS54240-Q1 Synchronize to External Clock

Other Parts Discussed in Thread: TPS54240-Q1


My customer has questions about TPS54240-Q1.
Could you tell me about questions?

 My customer want to change swithing frequency by external clock.
 ex. 400kHz -> 500kHz

1) Is there any specific about external clock range by RT resistor?
   ex. When RT=300k(=400kHz), how much can it input external clock range?

2) Is there any specific about duty of external clock?

Best Regards,