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TPS63027YFFT Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS63027YFFT Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 23 page 8 TPS63027 SLVSDK8 – DECEMBER 2016 www.ti.com Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Feature Description (continued) 9.3.2 Output Discharge Function When the device is disabled by pulling enable low and the supply voltage is still applied, the internal transistor use to discharge the output capacitor is turned on, and the output capacitor is discharged until UVLO is reached. This means, if there is no supply voltage applied the output discharge function is also disabled. The transistor which is responsible of the discharge function, when turned on, operates like an equivalent 120- Ω resistor, ensuring typically less than 10ms discharge time for 20-µF output capacitance and a 3.3 V output. 9.3.3 Thermal Shutdown The device goes into thermal shutdown once the junction temperature exceeds typically 140°C with a 20°C hysteresis. 9.3.4 Softstart To minimize inrush current and output voltage overshoot during start up, the device has a Softstart. At turn on, the input current raises monotonic until the output voltage reaches regulation. During Softstart, the input current follows the current ramp charging the internal Softstart capacitor. The device smoothly ramps up the input current bringing the output voltage to its regulated value even if a large capacitor is connected at the output. The Softstart time is measured as the time from when the EN pin is asserted to when the output voltage has reached 90% of its nominal value. There is a delay time from when the EN pin is asserted to when the device starts the switching activity. The Softstart time depends on the load current, the input voltage, and the output capacitor. The Softstart time in boost mode is longer then the time in buck mode. The inductor current is able to increase and always assure a soft start unless a real short circuit is applied at the output. 9.3.5 Short Circuit Protection The TPS63027 provides short circuit protection to protect itself and the application. When the output voltage does not increase above 1.2V, the device assumes a short circuit at the output and limits the input current to 4 A. |
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