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3.6 Start-up and Shutdown with EN
Figure 3-18
and
Figure 3-19
input voltage is initially applied and the output is inhibited by pulling EN to GND using an external function
generator. When the EN voltage is increased above the enable-threshold voltage, the start-up sequence begins
and the output voltage ramps up to the externally set value. In
EN to ground and the TPS54KC23 shuts down.
Figure 3-18. U2 Start-up with EN – 30-A Load
3.7 Thermal Performance
Figure 3-20
through
Figure 3-21
and
Figure 3-21
have only one TPS54KC23 on and loaded. A minimum of 10 minutes for soak time was used
before taking each measurement.
Figure 3-20. U1 Thermal Performance – 30-A Load
and U2 off
SLVUCU8 – JANUARY 2024
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show the start-up and shutdown waveforms for U2 with EN. In
show the temperature rise of the TPS54KC23 ICs at full 30-A load.
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Figure
3-19, the external function generator pulls
Figure 3-19. U2 Shutdown with EN – 30-A Load
Figure 3-21. U2 Thermal Performance – 30-A Load
and U1 off
TPS54KC23EVM Step-Down Converter Evaluation Module
Test Setup and Results
Figure
3-18, the
Figure 3-20
13
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