TPS54160-Q1 Datasheet, PDF (19/53 Pages) Texas Instruments – 1.5-A 60-V STEP-DOWN SWIFT DC/DC CONVERTER WITH Eco-Mode CONTROL

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TPS54160-Q1
SLVS922E – JULY 2009 – REVISED MARCH 2011
DETAILED DESCRIPTION (continued)
TPS54160
3 EN
EN1, EN2
4 SS/TR
6 PWRGD
VOUT1
VOUT2
TPS54160
3 EN
4 SS/TR
6 PWRGD
Figure 34. Schematic for Ratiometric Start-Up
using Coupled SS/TR Pins
Figure 35. Ratiometric Startup Using Coupled
SS/TR Pins
Figure 34 shows a method for ratiometric start-up sequence by connecting the SS/TR pins together. The
regulator outputs ramp up and reach regulation at the same time. When calculating the slow start time, the pullup
current source must be doubled in Equation 6. Figure 35 shows the results of Figure 34.
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