TPS63024

TPS630241, TPS630242

www.ti.com

SLVSCK8A – NOVEMBER 2014 – REVISED DECEMBER 2014

Feature Description (continued)

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 monotonically 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 typically a 100µs 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 total typical

Softstart time is 1ms.

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 TPS63024x 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 3A.

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Product Folder Links: TPS630241 TPS630242