Hello,
I use the LMZ12001 since 2 years and since 2 months I note a problem with this component.
This component is used to generate a 1V2 and a 3V3 for a Altera FPGA and I have a problem on the 3V3.
I have the feeling that at low current the LMZ12001 is not able to work correctly (only since 2 month, before, I had no problem!).
I did these tests :
- I have 5 x 22uF ceramic capacitor on the output and when I increase this value (to 300-500uF) it seems to be good.
- My input voltage is 12V, when I decrease to 5-6V, it seems to be good.
- When I heat the board, it seems to be good. (Integrated inductor whom the values changes with the temperature ? ...)
I see the good working or not of the product because the FPGA on the board resets. I'm sure sure sure that's the LMZ12001 which is deficient (I took 2 boards, one OK and the other one KO, I swapped all components and when I swapped the LMZ12001 the problem changes of boards, the test was done 4-5 times).
It's a big big problem, I'm not sur to have a perennial solutions as part of the 3 solutions quoted above and it's not normal to change everything after 2 years of good working.
I add that I bought maybe 15-20 LMZ12001 at Radiospares and Mouser to test it and I have 40-50% of deficient products.
Is it possible to check this quickly please ?
Best Regards,