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TPS63027YFFT Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS63027YFFT
Description  High Current, High Efficiency Single Inductor Buck-Boost Converter
Download  23 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS63027YFFT Fiches technique(HTML) 8 Page - Texas Instruments

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TPS63027
SLVSDK8 – DECEMBER 2016
www.ti.com
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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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