Hello guys,
One of our customers is designed their new power supply using LM5145. They are going to use Rsense mode for the current limit function. According to the section 8.3.10
"Current Sensing and Overcurrent Protection (ILIM)" of lm5145 datasheet, the section says that "Given the large voltage swings of ILIM in RDS-ON mode, a capacitor
designated CILIM connected from ILIM to PGND is essential to the operation of the valley current limit circuit. Choose this capacitance such that the time constant
RILIM · CILIM is approximately 6 ns."
I undestood like that the Cilim is needed in RDS-ON mode because SW node transient speed from zero to negative current is very faster than Rsense mode.
Does this sentence mean that Cilim is not needed when the current limiter is in Rsense mode because Rsense voltage node transient speed from zero to negative current
is slow? Or is it better to prove Cilim part land pattern without Cilim mounting?
Your reply would be much appreciated.
Best regards,
Kazuya Nakai.
