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9 / 22 page DocID025259 Rev 2 9/22 STEF4S Typical characteristics 22 5.1 Operating modes 5.1.1 Turn-on When the input voltage is applied and the EN pin is high, the output voltage is supplied with a slope defined by the internal dv/dt circuitry. If no additional capacitor is connected to CSS pin, the total time from the enable signal going high and the output voltage reaching the nominal value is around 0.6 ms. 5.1.2 Normal operating condition The STEF4S E-fuse behaves like a mechanical fuse, buffering the circuitry on its output with the same voltage shown at its input, apart from a small voltage fall due to the MOSFET RDS(on). 5.1.3 Output voltage clamp The internal voltage clamp circuit clamps the output voltage to the VClamp values reported in Table 5 if the input voltage exceeds the typical thresholds of 3.8 V in the 3.3 V mode and 5.7 V in the 5 V mode. 5.1.4 Current limiting When an overload event occurs, the current limiting circuit reduces the conductivity of the power MOSFET, in order to clamp the input current at the pre-programmed value. The current limit circuit has a foldback characteristic to reduce the power dissipation over the power MOSFET in short-circuit condition. 5.1.5 Thermal shutdown and auto-retry function If the device temperature exceeds the thermal shutdown threshold, typically 140 °C, the thermal shutdown circuitry turns the power MOSFET off and disconnects the load. Once the die temperature has decreased about 20 °C the device automatically attempts to apply again the power to the load (auto-retry). This cycle persists until the fault condition is removed. 5.2 Startup time and CSS calculation Connecting a capacitor between the CSS pin and GND allows the modification of the output voltage startup time.The startup time (Tss) is defined as the time interval between the device UVLO threshold, which has been overcome, and VOUT , which has reached 90% of the nominal value as shown in Figure 4. The below Table 6 shows the typical startup time obtained with the industry-standard values of CSS. Table 6. Startup time vs. Css capacitor value Parameter Value Css [nF] None 10 47 100 Tss [ms] 0.6 2.3 10.8 23 |
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