Is it wrong to go into an angel investment with the hope of paying off the debt before it converts and keeping your equity?
http://www.quora.com/Can-you-raise-money-from-angels-but-the...
However, most angels may not be too happy if that was your plan all along. They're putting money in on the hopes that your success will somehow multiply their money. If you're just planning to pay them back their interest, they might as well have put that same money into a bank.
Again, it really depends on your angel -- my strong advice to you is to be forthcoming about your goals. It's better to have everyone on the same page up front... especially if you plan on having a long term relationship.
Can anyone post or point to a sample document?
I'll post a note term sheet that I raised money on last year once I find it but notice the prepayment clause here: http://startuplawyer.com/convertible-notes/convertible-note-...
When you're raising on a convertible note, you're essentially taking a loan from the angel. You're promising to "pay them back" at the next financing by converting their money into stock equal to the principal + interest they've accrued on that note. If you really wanted to (and the term sheet doesn't preclude a payback), you could pay them back for only their principal & interest instead of converting them to stock.
I would be very interested if you could post that doc.