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| 型号： | TPS84320RUQT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 390 kHz SWITCHING FREQ-MAX, PQCC47 |
| 封装： | 9 X 15 MM, 2.80 MM HEIGHT, GREEN, PLASTIC, QFN-47 |
| 文件页数： | 13/28页 |
| 文件大小： | 903K |
| 代理商： | TPS84320RUQT |
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SS/TR
STSEL
AGND
CSS
(Optional)
SLUSAH7
– SEPTEMBER 2011
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.
Figure 32. Slow-Start Capacitor (CSS) and STSEL Connection
Table 6. Slow-Start Capacitor Values and Slow-Start Time
CSS (pF)
open
2200
4700
10000
15000
22000
25000
SS Time (msec)
1.1
1.9
2.8
4.6
6.4
8.8
9.8
Overcurrent Protection
For protection against load faults, the TPS84320 incorpoates output overcurrent protection. Applying a load that
exceeds the regulator's overcurrent threshold causes the regulated output to shut down. Following shutdown, the
output voltage periodically attempts to recover by initiating a soft-start power-up. This is described as a hiccup
mode of operation, whereby the module continues in a cycle of successive shutdown and power up until the load
fault is removed, as shown in Figure 33. During this period, the average current flowing into the fault is
significantly reduced. Once the fault is removed, the module automatically recovers and returns to normal
operation, as shown in Figure 34.
Figure 33. Overcurrent - Hiccup Mode
Figure 34. Removal of Overcurrent Condition
20
Copyright
2011, Texas Instruments Incorporated
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