That's a mosfet driver circuit (taken from here), I understand the operation of the circuit but i don't know what the purpose of R5 is. Is it a pull-up resistor?. Also, would it change anything if i pulled the base of Q1 down to ground instead of pulling it up?
The TL494 has an open-collector output. Without R5, Q1 won't turn on.
If you want to pull it down, you need a something to turn the transistor on with and I'm not sure that TL494 accepts voltages higher than GND on the emitter pin, you might need to look for another solution. A push-pull output driver for example.