SLUS907K January 2009 – June 2019 TPS2421-1 , TPS2421-2
PRODUCTION DATA.
The power limiting function of the TPS2421 provides effective protection and limits the maximum allowable resistive load (RMIN) during startup to ensure SOA of the device. Load resistance lower than RMIN can cause the output to shut off due to CT timeout or thermal shutdown. The equation for maximum load RMIN as a function of VIN, PLIM and ILIM is given by Equation 6:
where
The device fails to start if RLOAD < RMIN. It either enters thermal shutdown or CT timer may timeout. The load resistance during startup (RLOAD) must be higher than RMIN for a successful startup. Ensure that RLOAD is > RMIN per Equation 6.