Part Number: LM5117
Tool/software:
[Repeating info already posted on a locked thread]
On a few instances, we have experienced a failure of the LM5117 Buck Controller, which surprised us since we expected the failure in this circuit to be the thermal-heavy components (NFET, Inductor, sense resistor, etc.). What is the typical failure mechanism of this component? Can I send damaged components back for inspection?
My tardy response to the previous thread was waiting for the component to be replaced to confirm it was the failed component (it was). Again, this is strange -- I always viewed this component as the "brains" and the "muscles" were the inductor, NFET, sense resistor etc.
I included the schematic section with this component.
My company has used this circuit in other designs, albeit not at the current supply levels we are trying to achieve here. Peak currents were measured at 10.6A (26V output), system designed for 11.4A at 24V, all at a duty cycle of 25%. What isn't shown in the schematic is bulk capacitance we have prior to the stage (5mF electrolytic capacitance). We test over temp but we've seen the part get damaged at 25C also.
Thoughts?
