SLVSE26B November 2017 – April 2018 TPSM84824
Many of the common power supply sequencing methods can be implemented using the SS/TR, EN and PGOOD pins. The sequential method is illustrated in Figure 22 using two TPSM84824 devices. The PGOOD pin of the first device is coupled to the EN pin of the second device which enables the second power supply once the primary supply reaches regulation.
Simultaneous power supply sequencing can be implemented by connecting the resistor network of R1 and R2 shown in Figure 23 to the output of the power supply that needs to be tracked or to another voltage reference source. Use Equation 5 and Equation 6 to calculate the values of R1 and R2.