SLVSGP3A May 2023 – February 2024 TPS54KB20
PRODUCTION DATA
The device has a fixed, cycle-by-cycle negative overcurrent limit (ILS(NOC)). Similar with the positive overcurrent limit, the inductor current is monitored during the on-time of the low-side MOSFET. To prevent too large negative current flowing through the low-side MOSFET, when the device detects a –10A current (typical threshold) through the low-side MOSFET, the device turns off the low-side MOSFET and then turns on the high-side MOSFET for the on-time set by the one-shot timer (determined by VIN, VOUT, and fSW). After the high-side MOSFET on-time expires, the low-side MOSFET turns on again.
The device must not trigger the –10A negative current limit threshold during nominal operation, unless a small inductor value that is too small is chosen or the inductor becomes saturated. This negative current limit is used to discharge output capacitors after an output OVP event. See Overvoltage and Undervoltage for details.