Hello everbody,
I have a problem about LM2576.I have a power stage design but there is a problem at LM2576.First of all LM2576 is a buck converter so this buck converter is a SMPS and all SMPS converts POWER.
However it (LM2576) does not convert power.It is working like lineer regulator.
Output voltage of buck converter's is 5 volt. And maximum output current is 3 A . When I selected about 1,5 ohm resistor, output current was 3A but the problem is arising in this point.In this point,I have observed,input current was about 2,8 A.Input voltage was 8 volt.
If input voltage increase above 8 volt, lm2576 is shutting down itself.
I want to explain numerical value.For example if input voltage is 8 volt and output current is 3A,input current was about 2.8A but lm2576 worked about 10 min.İf input voltage above 8 volt and if output current higher than 1 A,LM2576 was shutdown suddenly.
Sorry for my english.My english is not very good but ı tried to explain my problem.
This is my circuit.
Input capacitor value = 470 uf and 50 volt
Output catch diode value = 60 volt , 2A
Output inductor value = 1uH , saturation 1.4 Amper , Max amper is 3A.
Output capacitor value = 470 uf and 25 volt
I am connecting my load to 5VP output.
