參數(shù)資料
型號(hào)： 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(yè)數(shù)： 20/48頁(yè)
文件大?。?/td> 852K
代理商： TPS2459RHB
SET
LIMIT
SUM
SENSE
R
I
0.675 V
R
=
÷
è
LIMIT
SET
0.0198 A
I
R
=
÷
W
è
OUT
SRC
g
V
I
t
C
D
@
D
UDG-09033
IN12
11
PASS
OUT12
R
SENSE
TPS2459
C
R > 1 kW
100 W
www.ti.com
SLUS917D – FEBRUARY 2009 – REVISED MAY 2010
(4)
The recommended value of RSUM is 6810 . This resistor should never equal less than 675 to prevent
excessive currents from flowing through the internal circuitry. Using the recommended values of RSENSE = 5 m
and RSUM = 6810 gives Equation 5.
(5)
A system capable of powering an 80-W AdvancedMC module consumes a maximum of 8.25 A according to
MicroTCA specifications. The above equation suggests RSET = 417 . The nearest 1% EIA value equals 422
. The selection of RSET for MicroTCA power modules is described in the Redundant vs. Non-redundant Inrush
Current Limiting section.
12-V Inrush Slew Rate Control
Although it is possible to slow the gate slew rate, it is very unlikely that would be necessary since the TPS2459
limits inrush current at turn on. The limit level is programmed by the user.
As normally configured, the turn-on slew rate of the 12-V channel output voltage VOUT is shown in Equation 6.
where
ISRC equals the current sourced by the PASS pin (nominally 30 mA)
Cg equals the effective gate capacitance
(6)
For purposes of this computation, the effective gate capacitance approximately equals the reverse transfer
capacitance, CRSS. To reduce the slew rate, increase Cg by connecting additional capacitance from PASS to
ground. Place a resistor of at least 1000
in series with the additional capacitance to prevent it from interfering
with the fast turn off of the FET.
Figure 22. RC Slew Rate Control
Copyright 2009–2010, Texas Instruments Incorporated
27
Product Folder Link(s): TPS2459
相關(guān)PDF資料
PDF描述
TPS24701DGK POWER SUPPLY SUPPORT CKT, PDSO8
TPS24710DGS POWER SUPPLY SUPPORT CKT, PDSO10
TPS24710 POWER SUPPLY SUPPORT CKT, PDSO10
TPS24711 POWER SUPPLY SUPPORT CKT, PDSO10
TPS24711DGSR POWER SUPPLY SUPPORT CKT, PDSO10
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TPS2459RHBT 功能描述:熱插拔功率分布 3V/12V Hot Swap & ORing Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
TPS2459RHBT 制造商:Texas Instruments 功能描述:Hot Swap Controllers TI 制造商:Texas Instruments 功能描述:IC, HOT SWAP & O-RING CTRL, 23V, QFN-32
TPS24700DGK 功能描述:熱插拔功率分布 2.5-18V Hi Eff Hot- Swap Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
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