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TPS61261DRVT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61261DRVT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page TPS61260, TPS61261 www.ti.com SLVSA99 – MAY 2011 Softstart and Short Circuit Protection After being enabled, the device starts operating. Until the output voltage reaches about 0.4 V, the average output current ramps up from zero to the programmed value, following the output voltage increasing. As soon as the output current has reached the programmed value it stays regulated at that value until the load conditions demand less current. This typically happens when the output capacitor is charged and the output voltage is regulated. During this start up the device can seamlessly change modes of operation. When the input voltage is higher than the output voltage the device operates in a linear mode using the rectifying switches for control. If the input voltage is lower than the output voltage it operates in a standard boost conversion mode. The boost conversion is non synchronous when the output voltage is below approximately 1.8 V and it is synchronous if the output voltage is higher than approximately 1.8 V. At short circuit conditions at the output the output current is limited to the programmed average current. If the short at the output causes the output voltage to drop below 0.4 V the average current decreases approximately linearily with the output voltage down to zero. Undervoltage Lockout An undervoltage lockout function prevents device start-up if the supply voltage on VIN is lower than the undervoltage lockout threshold defined in the ELECTRICAL CHARACTERISTICS table. When in operation, the device automatically shuts down the power stage if the voltage on VIN drops below the undervoltage lockout threshold. The device automatically restarts if the input voltage recovers to the minimum operating input voltage. Output Overvoltage Protection If for any reason the output voltage of the device exceeds its maximum recommended value the device stops operating. It will continue operting as soon as the output voltage has dropped below this threshold. Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 11 |
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