SNVSCK5 April 2024 TPS3842
ADVANCE INFORMATION
TPS3842 has adjustable sense time delay with external capacitors.
The time delay (tCTS) can be programmed by connecting a capacitor between CTS pin and GND.
The relationship between external capacitor CCTS_EXT (typ) and the time delay tCTS (typ) is given by Equation 4.
CCTS_EXT (typ) = is given in microfarads (μF)
The sense delay varies according to the external capacitor (CCTS_EXT). The minimum and maximum variance due to the constant is show in Equation 8 and Equation 9:
There is no limit to the capacitor on CTS pin. Make sure there is enough time for the capacitor to fully discharge when a voltage fault occurs to prevent the CTS capacitor from having charge before the next fault. Also, having a too large of a capacitor value can cause very slow charge up (rise times) and system noise can cause the internal circuit to trip earlier or later near the threshold.
* Leakages on the capacitor can effect accuracy of sense time delay.