Datasheet

EN
TPS54140A
3
SS/TR
4
PWRGD
6
EN
TPS54140A
3
SS/TR
4
PWRGD
6
EN1,EN2
VOUT1
VOUT2
TPS54140A
SLVSB55B –MAY 2012–REVISED JANUARY 2014 www.ti.com
DETAILED DESCRIPTION (continued)
Figure 34. Schematic for Ratiometric Start-Up Figure 35. Ratio-Metric Startup using Coupled
Sequence SS/TR pins
Figure 34 shows a method for ratio-metric start up sequence by connecting the SS/TR pins together. The
regulator outputs will ramp up and reach regulation at the same time. When calculating the slow start time the
pull up current source must be doubled in Equation 6. Figure 35 shows the results of Figure 34.
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