Datasheet

V
OUT
= 2 V /div
2 ms /div
V
IN
= 10 V /div
V
EN
= 2 V /div
V
OUT
= 2 V /div
1 ms /div
V
IN
= 10 V /div
V
EN
= 5 V /div
www.ti.com Test Setup and Results
2.10 Powering Up
The start-up waveforms are shown in Figure 14 and Figure 15. In Figure 14, the top trace shows V
IN
, the
middle trace shows EN, and the bottom trace shows V
OUT
. 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 3.3V. The input voltage for these plots is 24V with a
16Ω resistive load.
Figure 14. TPS54061EVM-142 Start-Up Relative to V
IN
In Figure 15, the top trace shows V
IN
, the middle trace shows EN, and the bottom trace shows V
OUT
. The
input voltage is initially applied with EN held low. When EN is released, the start-up sequence begins and
the output ramps up at the externally set rate toward the set value of 3.3 V. The input voltage for these
plots is 24 V with a 16Ω resistive load.
Figure 15. TPS54061EVM-142 Start-Up Relative to EN
11
SLVU721–May 2012 Evaluation Module for TPS54061 Synchronous Step-Down SWIFT
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