Datasheet

V = 5 V / div
IN
V = 1 V / div
OUT
Time = 2 msec / div
V = 5 V / div
IN
EN = 2 V / div
V = 2 V / div
OUT
Time = 2 msec / div
Test Setup and Results www.ti.com
2.9 Powering Up
Figure 9 and Figure 10 show the start-up waveforms for the TPS54622EVM-012. In Figure 9, the output
voltage ramps up as soon as the input voltage reaches the UVLO threshold as set by the R1 and R2
resistor divider network. In Figure 10, the input voltage is initially applied and the output is inhibited by
using a jumper at J3 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 1 Ω.
Figure 9. TPS54622EVM-012 Start-Up Relative to V
IN
Figure 10. TPS54622EVM-012 Start-Up Relative to Enable
10
TPS54622EVM-012, 6-A, SWIFT™ Regulator— Evaluation Module SLVU441A–May 2011–Revised September 2011
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