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LDL112PVR Datasheet(PDF) 9 Page - STMicroelectronics |
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LDL112PVR Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 32 page LDL112 Application information DocID026319 Rev 2 9/32 6 Application information 6.1 Thermal and short-circuit protections The LDL112 is self-protected from short-circuit condition and overtemperature. When the output load is higher than the one supported by the device, the output current increases until the limit of typically 2 A is reached, at this point the current is kept constant even when the load impedance is zero. Thermal protection acts when the junction temperature reaches 165 °C, therefore the IC shuts down. As soon as the junction temperature falls again below the thermal hysteresis value the device starts working again. In order to calculate the maximum power that the device can dissipate, keeping the junction temperature below the TOP , the following formula is used: Equation 1 6.2 Output voltage setting for ADJ version In the adjustable version, the output voltage can be set from 0.8 V up to the input voltage minus the voltage drop across the pass transistor (dropout voltage), by connecting a resistor divider between the ADJ pin and the output, thus allowing remote voltage sensing. The resistor divider could be selected by the following equation: Equation 2 It is recommended to use resistors with values in the rang e of 10 kΩ to 50 kΩ. Lower values can also be suitable, but current consumption increases. P DMAX = (125 - TAMB )/RTHJ A |
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