TL494 PWM will not operatate in push-pull despite pins 13 and 14 being shorted

[Verliebt_in_München17]

[SOLVED] My trigger was set to alternate.
So the circuit works comepletly fine, it's just that the IC won't seem to work in a push-pull configuration, which i want it to be, i have triple checked every connection possible, and i have concluded that my circuit design could be wrong so i need somebody to help me find any other triggers that could lead the IC to stay hard-locked in single-ended mode.
I will be providing addition information and pictures upon request.

Schematic


Underside


Comparision of the sawtooth wave on pin 5 and one of the outputs


 
My bad if the images are too large, no idea how to make them smaller

[Benta]

The whole upper half of your circuit is dysfunctional.
You have three inputs connected together, but none of them are driven by an output or a voltage source. On top of that, there's a questionable "capacitor divider" with no apparent purpose.

[DavidAlfa]

The TL494 outputs are made by NPN BJTs, so depending on how you connect them, they can push or pull, but not both.

You can combine both outputs for a full push-pull stage, IIRC you can do so with this:
- C1 to VDD.
- E1 and C2 connected together, this is the output.
- E2 to GND.



Your circuit doesnt make much sense. How do you expect it to work without any feedback?
If you want to test the PWM output with a potentiometer, try the test circuit included in the datasheet.

[xavier60]

The DSO shows the output being half the oscillator frequency. That indicates push-pull mode.
The output signals are expected to be antiphase to each other.
EDIt: It's odd that the output transitions don't align with the step in the oscillator sawtooth.
Maybe the DSO is set to Alternate Trigger mode?
Maybe this explains the original problem. The 2 outputs will appear to be in phase.

[Verliebt_in_München17]

Yes, the scope's trigger is set to alternate beacuse i was getting an unstable reading, i'll try to see if the problem was with my scope all along

edit: yes it was, thanks for correcting my newbie mistake

[xavier60]

The DSO will have settings to improve triggering stability that can be experimented with.
Starting with selecting a fast transition to trigger from. For example, the negative step of the oscillator waveform rather than the positive going ramp.