Datasheet

V = 1 V/div (1 V pre-bias)
OUT
Time = 2 ms/div
V = 5 V/div
IN
V = 2 V/div
OUT
I = 10 A/div
OUT
Time = 20 ms/div
PH = 10 V/div
Test Setup and Results www.ti.com
2.10 Pre-Bias Start-Up
The TPS54821 is designed to start up into a pre-biased output. The output voltage is not discharged to
ground at the beginning of the slow-start sequence. Figure 11 shows the start-up waveform with the
output voltage pre-biased to 1 V.
Figure 11. TPS54821EVM-049 Start-Up Into Pre-Bias
2.11 Hiccup-Mode Current Limit
The TPS54821 features hiccup-mode current limit. When an overcurrent event occurs, the TPS54821
shuts down and restarts. Figure 12 shows restart sequence in an over-current condition.
Figure 12. TPS54821EVM-049 Hiccup-Mode Current Limit
10
TPS54821EVM-049, 8-A, SWIFT™ Regulator— Evaluation Module SLVU479–October 2011
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