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Using External Sync for TPS40055

Other Parts Discussed in Thread: TPS40055

I am planning to use TPS40055 in my new design with external SYNC input.

1) I would like to how we can simulate this scenario SwitcherPro design tool

2) Also I would like to understand minimum and maximum frequency input for SYNC pin (pin 4) 

3) What is the relation between SYNC frequency and Fsw (Switching frequency); Is Fsw same as SYNC when I use external sync for TPS40055