Texas Instruments TPS54334EVM-722, User Manual, Page: 10 / 21

EN = 2 V/div
PGOOD = 2 V/div
V 2 V/div
OUT
=
V = 5 V/div
IN
EN = 2 V/div
PGOOD = 2 V/div
V 2 V/div
OUT
=
V = 5 V/div
IN
Test Setup and Results
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2.9 Powering Up
Figure 11 and Figure 12 show the start-up waveforms for the TPS54334EVM-722. In Figure 11 , the output
voltage ramps up as soon as the input voltage reaches the UVLO threshold as set by the R1and R2
resistor divider network. In
Figure 12 , the input voltage is initially applied and the output is inhibited by
using a jumper at JP1 to tie EN to GND. When the jumper is removed, EN is released. When the EN
voltage reaches the enable-threshold voltage, the start-up sequence begins and the output voltage ramps
up to the externally set value of 3.3 V. The input voltage for these plots is 12 V and the load is 5
Ω .
Figure 11. TPS54334EVM-722 Startup Relative to V
IN
Figure 12. TPS54334EVM-722 Startup Relative to Enable
10 TPS54334EVM-722 3-A Regulator Evaluation Module SLVUAH4 – August 2015
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