Texas Instruments TPS54232EVM-415, User Manual

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2.8 Input Voltage Ripple
The TPS54232EVM-415 input voltage ripple is shown in Figure 2-8 . The output current is the rated full load of 2
A and V
IN
= 15 V. The ripple voltage is measured directly across the input capacitors.
VIN
PH
t - Time - 1 s/div
m
Figure 2-8. TPS54232EVM-415 Input Ripple
2.9 Powering Up
The start-up waveforms are shown in Figure 2-9 and Figure 2-10 . In Figure 2-9 , the top trace shows V
OUT
,
and the bottom trace shows V
IN
. In Figure 2-10 , the top trace shows V
OUT
whereas the bottom trace shows
the slow start voltage . In Figure 2-10 , the input voltage is initially applied and the output is inhibited by using a
jumper at J2 to tie EN to GND. When the jumper is removed, EN is released. When the EN voltage reaches the
enable-threshold voltage of 1.25 V, the start-up sequence begins and the output ramps up at the externally set
rate toward the set value of 2.5 V. The input voltage for these plots is 12 V and there is no load.
VOUT
VIN
t - Time - 2 ms/div
Figure 2-9. TPS54232EVM-415 Start-Up Relative to V
IN
Test Setup and Results www.ti.com
8 TPS54232 Step-Down Converter Evaluation Module User's Guide SLVU277A – JANUARY 2009 – REVISED OCTOBER 2021
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