Start-Up Into Pre-Bias; Figure 3-26. U2 Start-Up Into 0.5-V Pre-Bias - Texas Instruments TPS543B22EVM User Manual

Test Setup and Results

3.10 Start-up Into Pre-Bias

Figure 3-26 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.
VIN=12V IOUT = 0A
18 TPS543B22EVM SWIFT Step-Down Converter Evaluation Module
EN (2V/div)
SW (5V/div)
400 s/div

Figure 3-26. U2 Start-up Into 0.5-V Pre-Bias

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VOUT (500mV/div)
PGOOD (5V/div)
SLUUCH6B – SEPTEMBER 2022 – REVISED SEPTEMBER 2023
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