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參數資料
| 型號： | TPS2459RHBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數： | 22/44頁 |
| 文件大小： | 983K |
| 代理商： | TPS2459RHBR |
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PRODUCTPREVIEW
12-V ORing Operation for Redundant Systems
UDG-09035
14
SENP
13
SET
12
SENM
11
PASS
6
BLK
8
OUT12
R
SET
R
SENSE
12 V
V
IN
TPS2459
www.ti.com ............................................................................................................................................................................................ SLUS917 – FEBRUARY 2009
Table 12. Configuring 12-V Current Limits in Non-Redundant Systems
ILIMIT (A) – INRUSH
CBULK CHARGE TIME
FAULT TIME
ILIMIT (A)
12CLx
PLOAD
12VNRS
(ms)
RSET
OPERATIONAL
[3:0]
(W)
12VNRS = 1
R6[4]=0
R6[4]=1
800
F
1600
F
800
F
1600
F
412
1111
8.17
80
6.4
12.8
8.5
17
698
111
13.84
8.3
80
1.34
2.68
2
3.5
845
101
16.75
8.38
80
0.95
1.9
1.5
3
The 12-V channels use external pass FETs to provide reverse blocking. The TPS2459 pulls the BLK pin high
when the input-to-output differential voltage VIN12–OUT12 exceeds a nominal value of 10 mV, and it pulls the pin
low when this differential falls below a nominal value of –3 mV. These thresholds provide a nominal 13 mV of
hysteresis to help prevent false triggering.
The source of the blocking FET connects to the source of the pass FET, and the drain of the blocking FET
connects to the load. This orients the body diode of the blocking FET such that it conducts forward current and
blocks reverse current. The body diode of the blocking FET does not normally conduct current because the FET
turns on when the voltage differential across it exceeds 10 mV.
Applications that do not use the blocking FET should clear the associated 12OR bit to turn off the internal
circuitry that drives the BLK pin. (See Figure 24).
Figure 24. ORing Thresholds
Copyright 2009, Texas Instruments Incorporated
29
Product Folder Link(s): TPS2459
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