I have a ATX power with kia494p IC. ( This IC is like TL494) and I need to reconfig the cirrent limiter or short-circuit protection to upper ampers.So how can I do this guys?
Need a schematic. The '494 has 2 independent error amps, one is generally used for voltage sensing and the other for current. What you want to do is find the one used for current, and look for a way to change the ratio of the resistances involved. Could be as simple as going from a .02Ω current-sensing resistor to .015Ω.
My smps is made for voltage-mode feedback and with pin 4 puls shoutdown is sent when the -12v and -5v decrease down to -14v !
So I could increase current limite by change R29 to achieve this purpose.But I had same problem when the load was capacitive. This problem resolved by adding a 100uf capacitor between base and emitter of T6.