Hi everyone,
for a power supply on a PCBA we use the LM5088MH-1 (dithering) to generate 24V and 5V from 48V input voltage.
Both supplies have a wide range of load scenarios: 0-10A, running at approx. 300kHz.
At the 24V level, we see sometimes two behaviors that I would like to gather more information about.
First scenario:
Occasionally, one 24V switcher circuit is not stable and shows a saw tooth output instead of flat 24V.
Question 1: If this is applied over a longer period, can this condition destroy the LM5088?
Question 2: What causes the output voltage to oscillate like this (saw tooth)?
Second scenario:
Different load scenarios from low load (open clamps) to approx. 4A in 0.5A steps (see blue: Current probe, showing load current) are shown.
My understanding is that the oscillation seen in three of these pictures are results of instabilities in the feedback loop.
Picture 1,2 & 4
Is that correct?
Thanks in advance.
Steve
