So, I just got a pack of 10 TL494 straight from the One Hung Low market on aliexpress and when I build the test circuit in the datasheet, or even apply power to them they start pulling around 200-300mA and my supplies current limit kicks in. The chips themselves get a little hot, has anyone else had an issue with this? Did I just get faulty parts or am I an idiot?
I replaced the 160 ohm resistors with 1k ones since I dont have a power resistor rated that high so the current draw should be even lower. When I even just set pin 13 to ground or to vcc and hook up pin 12 to power and pin 7 to ground the chip still draws too much current and my power supply kicks in to limit the current. Before trying this out I hooked up the circuit for just power, the oscillator and grounded pin 13 with another tl494 and I probed the oscilator and it was giving me a much higher frequency in the 500-600mV range which was something strange as well. Has anyone else had a similar issue?
I replaced the 160 ohm resistors with 1k ones since I dont have a power resistor rated that high so the current draw should be even lower. When I even just set pin 13 to ground or to vcc and hook up pin 12 to power and pin 7 to ground the chip still draws too much current and my power supply kicks in to limit the current. Before trying this out I hooked up the circuit for just power, the oscillator and grounded pin 13 with another tl494 and I probed the oscilator and it was giving me a much higher frequency in the 500-600mV range which was something strange as well. Has anyone else had a similar issue?