hi，
When the customer uses LM5021, the output current increases, the CS pin output exceeds 0.5V, and the chip output low voltage. Why is the output voltage not 0? Is it because of periodic current limitation? If yes, what is the limit or range of periodic current limiting and direct closing?
Thanks！
Hi Jeon,
Yes, you can find the explanation at 7.4.5 Operation Overload in the datasheet.
"7.3.6 Hiccup mode overload current limiting" explains that COMP pin voltage increases when CS pin is overloaded (>0.5V) and will be limited by cycle-by-cycle current limit comparator. When COMP exceeds 4.6V the SS capacitor Css discharges in 10uA current speed (VOUT not yet shut down at this time) until it reaches the hiccup mode threshold (VHIC=4.6V) and Vout shuts down.
To calculate the time that Vout is not shut down is listed here:
