Texas Instruments TPS543820EVM, User Manual, Page: 21 / 38

3.10 Start-up Into Pre-Bias
Figure 3-32 shows the EN start-up of U2 into a pre-biased output. The output voltage is pre-biased by toggling
the EN pin low then high at a rate such that the output voltage does not fully discharge before EN goes high
again.
Time (400 µs/div)
VOUT (500 mV/div)
SW (10 V/div)
EN (2 V/div)
PGOOD (5 V/div)
Figure 3-32. U2 Start-up Into 0.5-V Pre-Bias
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SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021
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TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's
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