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參數資料
| 型號： | TPS84210RKGT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PQCC39 |
| 封裝： | 9 X 11 MM, 2.80 MM HEIGHT, GREEN, PLASTIC, BQFN-39 |
| 文件頁數： | 10/26頁 |
| 文件大小： | 875K |
| 代理商： | TPS84210RKGT |
SS/TR
STSEL
AGND
CSS
(Optional)
UDG-11119
SLUSAN7
– 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 25. 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 TPS84210 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
18
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS84210
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