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LM22679 Datasheet(PDF) 11 Page - Texas Instruments |
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LM22679 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page 0.0 0.2 0.4 0.6 0.8 1.0 1.2 5 10 15 20 25 30 35 40 45 SHORT CIRCUIT VOLTAGE (v) SAFE OPERATING AREA LM22679, LM22679-Q1 www.ti.com SNVS581L – FEBRUARY 2013 – REVISED NOVEMBER 2014 Device Functional Modes (continued) (5) Where: Fsw is the normal switching frequency. Vin is the maximum for the application. If the overload drives the output voltage to less than or equal to Vx, the part will enter current foldback mode. If a given application can drive the output voltage to ≤ Vx, during an overload, then a second criterion must be checked. Equation 6 gives the maximum input voltage, when in this mode, before damage occurs. (6) Where: Vsc is the value of output voltage during the overload. fsw is the normal switching frequency. NOTE If the input voltage should exceed this value, while in foldback mode, the regulator and/or the diode may be damaged. It is important to note that the voltages in these equations are measured at the inductor. Normal trace and wiring resistance will cause the voltage at the inductor to be higher than that at a remote load. Therefore, even if the load is shorted with zero volts across its terminals, the inductor will still see a finite voltage. It is this value that should be used for Vx and Vsc in the calculations. In order to return from foldback mode, the load must be reduced to a value much lower than that required to initiate foldback. This load "hysteresis" is a normal aspect of any type of current limit foldback associated with voltage regulators. The safe operating area, when in short circuit mode, is shown in Figure 11. Operating points below and to the right of the curve represent safe operation. Figure 11. SOA Copyright © 2013–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM22679 LM22679-Q1 |
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