luckym
Member level 1
Hello.
I'm building a regulated current supply with LM2576 (pict 1). It works OK but in the boundary positions (max/min current) it behaves badly(pict. 2 and 3)(yellow (A) channel is voltage at the output from IC and blue (B) is the voltage at the FB). It happens at the time the transistor is switched OFF or ON and there are transients on the FB line. I think the problem is caused by the spikes in the FB. The spikes are on the output terminal also (pict 4). I want to use it with inductive load (valve coil). And if I connect inductive load the problem get worse.
I haven't work with switching PS yet so thanks for any advice.
regards
michal
I'm building a regulated current supply with LM2576 (pict 1). It works OK but in the boundary positions (max/min current) it behaves badly(pict. 2 and 3)(yellow (A) channel is voltage at the output from IC and blue (B) is the voltage at the FB). It happens at the time the transistor is switched OFF or ON and there are transients on the FB line. I think the problem is caused by the spikes in the FB. The spikes are on the output terminal also (pict 4). I want to use it with inductive load (valve coil). And if I connect inductive load the problem get worse.
I haven't work with switching PS yet so thanks for any advice.
regards
michal