TPS84A20 Datasheet, PDF (21/30 Pages) Texas Instruments – 2.95-V to 17-V Input, 10-A Synchronous Buck, Integrated Power Solution

TPS84A20
www.ti.com
SLVSBC6 – MARCH 2013
Slow Start (SS/TR)
Connecting the STSEL pin to AGND and leaving SS/TR pin open enables the internal SS capacitor with a slow
start interval of approximately 1.2 ms. Adding additional capacitance between the SS pin and AGND increases
the slow start time. Increasing the slow start time will reduce inrush current.Table 6 shows an additional SS
capacitor connected to the SS/TR pin and the STSEL pin connected to AGND. See Table 6 below for SS
capacitor values and timing interval.
SS/TR
C_SS
(Optional) _AGND
STSEL
Figure 32. Slow-Start Capacitor (C_SS) and STSEL Connection
Table 6. Slow-Start Capacitor Values and Slow-Start Time
C_SS (nF)
open
3.3
4.7
10
15
22
33
SS Time (msec)
1.2
2.1
2.5
3.8
5.1
7.0
9.8
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