ZHCSI22E October 2017 – August 2019 TPS2662
Connect a resistor across ILIM to RTN to program the over load current limit I(OL). During over load conditions the device regulates the current through it at I(OL) programmed by the R(ILIM) resistor as shown in Equation 3 for a maximum duration of tCL(dly).
During the current limit operation the output voltage droops and this may cause the device to hit the thermal shutdown threshold T(TSD) before tCL(dly) time. Once the thermal shutdown threshold is hit or tCL(dly) is elapsed, the internal FETs of TPS2662x will turn OFF. FETs in TPS26620, TPS26622 and TPS26624 remain OFF and latched. To reset the latch, cycle the SHDN, or recycle the VIN. TPS26621, TPS26623 and TPS26625 commences an auto-retry cycle after a retry time of 512 msec. The internal FETs turn back on in dVdT mode after this retry time. If the overload still exists then the device regulates the current at programmed current limit I(OL).
|Load transition from 120 Ω to 20 Ω||VIN = 24 V, RILIM = 7.5 kΩ|
|Load transition from 20 Ω to 120 Ω||VIN = 24 V, RILIM = 7.5 kΩ|