Figure 2-21 and Figure 2-22 show the start-up waveforms for the TPS54J060EVM-067 with V_IN = 12 V. The TPS54J061EVM-067 has similar behavior and the only difference is the soft-start time is shorter at 1.5 ms typical as a result of the lower 0.6-V reference. The start-up sequence begins as soon as the EN voltage is increased above the enable threshold voltage, and the output voltage ramps up to the set value.

Figure 2-23 shows the TPS54J060EVM-067 shutdown with V_IN = 12 V.

Figure 2-21 EN Start-up With 0.3-Ω Load

Figure 2-23 EN Shutdown With 0.3-Ω Load

Figure 2-22 EN Start-up With 0.3-Ω Load, VCC and SSREFIN