No Limit Holdem Tournament • 2 Players

$14.69+$0.31

High card / low card holdings are good candidates to put in your raise-fold range pre @ 9-12 BB because they have blockers to a calling range and play poorly postflop and vs 3b jamming ranges. 
But limping is perfectly fine too. 
 
As played, on the flop, the key thing here is villain's donk and in particular his sizing. 
He donks out full pot 100 into 100, leaving 490 - 50 - 100 = 340 behind.
If you jam on him, he will be layed odds of 340 / (2 * 490 ) = 35%
He would have to bet and call off here with any made hand or draw with (35 / 4) = 8 outs.
So if he even had 2 over cards, with some high card show down value he would have to call off. 
=> He is pot committed.
But, more importantly, what sort of range does a villain donk full pot with? 
=> usually a made hand which is vulnerable and would rather get all in now. 
 
I believe this line has strongly signalled to you that he is getting all in.
His most likely hand is a pair. 
So given these two pieces of information, we can basically solve to see whether we have enough equity to call a jam because his pot committing donk is effectively a jam (he's likely not donk folding full pot). 
 
There was 100 in the pot and 490 - 50 -= 440 stacks on the flop. 
Had villain donk jammed, you would have been layed 440 / 980 = 45% pot odds. 
 
Do you have enough equity to call?
If yes, you were calling a jam anyway so get it in now. 
 
You have 2 overcards, an OESD and a backdoor FD. 
2 overcards = 6 outs
OESD = 8 outs
backdoor FD = 1 out
You have 6+8+1 = 15 outs
Factor down by 20% for the times you hit and he rebinks / when your outs are dirty (eg. he slow played preflop). 
15 * 0.8 = 12 outs (adjusted)
 
So you have 4x - (x-9) = 4*12 - 3 = 45% equity. 
=> You're pretty much at an indifference point between jamming it and folding. 
 
So if my estimate of 20% for the time you hit and he rebinks / when your outs are dirty is too high, you should get it in.
If it was too low, you should fold. 
 
I don't think flatting is really an option but I would be open to being convinced otherwise. 
 
Pretty close spot, I think you played it fine :)