Hi,
We are using TPS40200DR in the design as buck controller. The output of the controller is 5V,1A and input is 24V. We are not using ISNS and shorted to VDD. In the device datasheet, it's noted " the current limit resistor and its associated circuitry can be eliminated and the ISNS pin (pin 7) and the VDD (Pin 8) are shorted. The result of this however, may result in damage to the device or PC board during an overcurrent event.". Since we are not using current sense, can I know it is safe to short the ISNS to VDD?
Understand the TPS40200 doesn't have pulse-by-pulse OCP. so when a pulse of current trip the OC threshold, the device enters hiccup immediately. This is why a lower frequency cutoff filter is used for the current sensing section. Otherwise, load transients can trip OCP. Typically for a device that does offer pulse-by-pulse, the cutoff frequency for the current sense filter would be approximately 10XFsw. So for my case: current sensing is not required, Is it necessary for me to put an small RC filter to the current sensing network to reduce nuisance tripping due to noise pickup? Hope to hear expert review on this.
Rgds,
kpk
