What is the purpose of this pull up resistor in totem pole?
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.