To use external sequencing, either connect all the enable pins (ENSW1, ENSW2, ENSW3, and ENSW4) to an external sequencing controller, or connect them to PGOOD outputs as shown in Figure 8-4. By default, t_{ON_DELAY} and t_{OFF_DELAY} are both set to 5 ms. This allows the user complete flexibility of sequencing order and timing with the ENSWx pins without modifying any of the default settings in the TPS65400.

A. Default behavior (external sequencing)

Figure 8-4 Example of Sequencing Where Timing is Controlled by an External Sequencer With ENSWx Pins