JAJSPW9J december 2003 – august 2023 TPS2061 , TPS2062 , TPS2063 , TPS2065 , TPS2066 , TPS2067
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A sense FET is employed to check for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the series resistance of the current path. When an overcurrent condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault is present long enough to activate thermal limiting.
There are two kinds of current limit profiles for the TPS20xx family of devices.
All devices (excluding TPS2065DBV) have an output I vs V characteristic similar to the plot labeled Current Limit with Peaking in Figure 9-4. This type of limiting can be characterized by two parameters, the overcurrent trip threshold (IOC), and the short-circuit output current threshold (IOS).
Devices TPS2065DBV have an output I vs V characteristic similar to the plot labeled Flat Current Limit in Figure 9-4. This type of limiting can be characterized by one parameters, the short circuit current (IOS).