Datasheet

V = 2 V / div
OUT
Time = 2 msec / div
EN = 5 V / div
V = 5 V / div
IN
PWRGD = 5 V / div
I = 5 A / div
OUT
Time = 1 msec / div
V = 1 V / div
OUT
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Figure 13. TPS54478EVM-037 Shut-down Relative to EN
2.11 Hiccup Mode Current Limit
The TPS54478 has hiccup mode current limit. When the peak switch current exceeds the current limit
threshold, the device shuts down and restarts. Hiccup mode current limit operation is shown in Figure 14
and Figure 15. Figure 14 shows the activation of hiccup mode current limit. When the peak current limit is
exceeded, the output voltage is dissabled. Figure 15 shows the operation of the TPS54478 with the output
shorted to ground. The device will continuously reset until the fault condition is removed.
Figure 14. TPS54478EVM-037 Hiccup Mode Current Limit Shut-down
11
SLVU470–June 11 TPS54478EVM-037 4-A, SWIFT™ Regulator Evaluation Module
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