2.10 Hiccup Overcurrent Mode Operation
shows the TPS54521EVM-607 operating in a near shorted output (0.1 Ω load) condition. If the
current in the high-side MOSFET reaches the current limit for 512 switching cycles in a row, the TPS54521
enters hiccup overcurrent protection and stops switching (hiccups) for the next 16384 cycles.
Time = 20 msec / div
Vout = 2 V / div
SS/TR = 1 V / div
PH = 10 V / div
Inductor Current =10 A / div
Vin = 12 V
Load = 0.1 Ω
Figure 2-11. TPS54521EVM-607 Overcurrent Hiccup Mode
2.11 Thermal Characteristics
This section shows a thermal image of the TPS54521EVM-607 running at 12 V input and 5 A load and a graph
showing the junction temperature vs. output current of the EVM circuit. There is no air flow and the ambient
temperature is 25°C. The peak temperature of the IC (91.9°C) is below the maximum recommended operating
condition listed in the data sheet of 125°C.
Figure 2-12. TPS54521EVM-607 Thermal Image
Test Setup and Results
SLVU379A – AUGUST 2010 – REVISED AUGUST 2021
TPS54521 Step-Down Converter Evaluation Module User's Guide
11
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