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參數資料
| 型號： | TPS2459RHB |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | PLASTIC, QFN-32 |
| 文件頁數： | 28/48頁 |
| 文件大小： | 852K |
| 代理商： | TPS2459RHB |
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FAULT
IN12
CL
P
0.01
V
I
@
SLUS917D – FEBRUARY 2009 – REVISED MAY 2010
www.ti.com
Fault Timer Programming
Both of the TPS2459 channels include a fault timer. The timer begins operating whenever the channel enters
current limit. If the channel remains in current limit so long that the fault timer runs out, then the channel turns off
the pass FET and reports a fault condition by means of the xFLT bit in the I2C interface.
The fault timers are independently programmable from 0.5 to 15.5 ms in steps of 0.5 ms using the appropriate
xFT bits. A code of xFT = 00001B corresponds to the minimum programmable time of 0.5 ms. The code xFT =
00000B corresponds to an extremely short time interval of no practical use. The locations of the fault timer
programming bits are shown in Table 13.
Table 13. Fault Time Control Bits
FAULT TIME (ms)
CHANNEL
VOLTAGE (V)
8
4
2
1
0.5
12
R4[4]
R4[3]
R4[2]
R4[1]
R4[0]
REGISTER[
BIT]
3.3
R5[4]
R5[3]
R5[2]
R5[1]
R5[0]
Select the shortest fault times sufficient to allow down-stream loads and bulk capacitors to charge. Shorter fault
times reduce the stresses imposed on the pass FETs under fault conditions. This consideration may allow the
use of smaller and less expensive pass FETs for the 12-V channels.
The TPS2459 supports two modes of fault timer operation. Clearing the FLTMODE bit causes a channel to latch
off whenever its fault timer runs out. The channel remains off until it has been disabled and re-enabled (see
Enable Functions section). The TPS2459 operates in this manner by default. Setting the FLTMODE bit causes a
faulted channel to automatically attempt to turn back on after a delay roughly one hundred times the fault time.
This process repeats until either the fault disappears or the user disables the channel. The pass FET for a 12-V
channel with a shorted output must therefore continuously dissipate the following power;
where
VIN12 equals the voltage present at the input of the 12-V channel
ICL equals the current limit setting for this channel (the inrush current if 12VNRS is set)
(15)
When used in MicroTCA Power Modules it is very important to protect the OUT12 pin by connecting a Schottky
diode from the OUT12 pin to GND. The relatively long and uncontrolled load line lengths to the AdvancedMC
modules make it quite likely that shutting off while under load causes an inductive transient to pull the OUT12 pin
below -0.3 V. Pulling OUT12 below this level can disrupt proper device operation.
34
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2459
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