SNVSCK5 April 2024 TPS3842
ADVANCE INFORMATION
TPS3842 has adjustable reset release time delay with external capacitors.
The time delay (tCTR) can be programmed by connecting a capacitor between CTR pin and GND.
The relationship between external capacitor CCTR_EXT (typ) and the time delay tCTR (typ) is given by Equation 7.
CCTR_EXT (typ) = is given in microfarads (μF)
The reset delay varies according to the external capacitor (CCTR_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 CTR pin. Having a too large of a capacitor value can cause very slow charge up (rise times) due to capacitor leakage and system noise can cause the internal circuit to hold RESET active.
* Leakages on the capacitor can effect accuracy of reset time delay.