LMZ30602 Datasheet, PDF (17/32 Pages) Texas Instruments – 2A SIMPLE SWITCHER Power Module with 2.95V-6V Input in QFN Package

LMZ30602
www.ti.com
SNVS997 – JULY 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 1.1 ms. Adding additional capacitance between the SS pin and AGND increases
the slow start time. 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
UDG-11119
Figure 25. Slow-Start Capacitor (C_SS) and STSEL Connection
C_SS (pF)
SS Time (msec)
Table 6. Slow-Start Capacitor Values and Slow-Start Time
open
1.1
2200
1.9
4700
2.8
10000
4.6
15000
6.4
22000
8.8
25000
9.8
Overcurrent Protection
For protection against load faults, the LMZ30602 uses current limiting. The device is protected from overcurrent
conditions by cycle-by-cycle current limiting and frequency foldback. During an overcurrent condition the output
current is limited and the output voltage is reduced, as shown in Figure 26. When the overcurrent condition is
removed, the output voltage returns to the established voltage, as shown in Figure 27.
Figure 26. Overcurrent Limiting
Figure 27. Removal of Overcurrent Condition
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