Texas Instruments TPS54240EVM-VSON, User Manual, Page: 11 / 25

Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Power Good = 5 V / div
Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Power Good = 5 V / div
Time = 5msec / div
EN = 2 V / div
Vin = 10 V / div
Vout = 2 V / div
Soft Start = 2 V / div
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Test Setup and Results
11 SNVU602 – May 2019
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TPS54240EVM-VSON Regulator Evaluation Module
2.7 Powering Up
The start-up waveforms are shown in Figure 12 . Start-up is relative to V
IN
rising. The input voltage is
initially applied, and when the input reaches the undervoltage lockout threshold, the start-up sequence
begins, and the output ramps up at the externally set rate toward the set value of 3.3 V.
Figure 12. TPS54240EVM-VSON Start-Up
2.8 Power Good Output
The power-good (PWRGD) pin can be pull up by a 10-k Ω resistor to V
OUT
or an external voltage source.
When connected to V
OUT
, the power good output waveforms are shown in Figure 13 . When connected to
an external 3.3 V, the power-good output waveforms are shown in Figure 14 .
Figure 13. TPS54240EVM-VSON Power-Good Output
(pulled up to V
OUT
)
Figure 14. TPS54240EVM-VSON Power-Good Output
(Pulled up to external 3.3 V)