SLVUAO9C March 2016 – June 2021 TPS56C215
2.9 Powering Up
Figure 2-14 and Figure 2-15 show the start-up waveforms for the TPS56C215EVM-762. In Figure 2-14, the output voltage ramps up as soon as the input voltage reaches the UVLO threshold. In Figure 2-15, 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, the start-up sequence begins and the output voltage ramps up to the externally set value of 1.2 V. The input voltage for these plots is 12 V and the load is 1 Ω.
Figure 2-14 TPS56C215EVM-762 Start-Up Relative to VIN
Figure 2-15 TPS56C215EVM-762 Start-Up Relative to Enable