640 credit score is fine for a condo purchase on a conventional loan ( for FHA the property has to be FHA approved, which is harder to find in Florida)
you can go as high as 95% LTV on a condo purchase with very good credit
Anything above 80% LTV requires mortgage insurance , so that is where one runs into issues with how much down payment you may be required.
since you are putting 20% down, you should be fine
pls call me if you have any more questions
Mortgage Loan Specialist
NMLS # 519971
407 924 2759