參數(shù)資料
型號： TPS24710DGS
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁數(shù)： 15/34頁
文件大?。?/td> 2148K
代理商： TPS24710DGS
LOAD
PROTECTION
0.1 F
B0440-02
M
1
12-VMainBusSupply
TIMER
OUT
GA
TE
VCC
SENSE
GND
TPS2471x
Specifications(atOutput):
PeakCurrentLimit=12 A
NominalCurrent=10 A
R
1.2
LOAD
W
C
470 F
OUT
C
T
R
SENSE
R
GATE
(
)
VCC
SENSE
LIM
SENSE
V
R
,
I
therefore,
25 mV
R
2 m
12 A
-
=
W
SLVSAL2C
– JANUARY 2011 – REVISED MAY 2011
threshold.
DESIGN EXAMPLE: POWER-LIMITED START-UP
This design example assumes a 12-V system voltage with an operating tolerance of
±2 V. The rated load current
is 10 A, corresponding to a dc load of 1.2
. If the current exceeds 12 A, then the controller should shut down
and then attempt to restart. Ambient temperatures may range from 20
°C to 50°C. The load has a minimum input
capacitance of 470
μF. Figure 34 shows a simplified system block diagram of the proposed application.
This design procedure seeks to control the junction temperature of MOSFET M1 under both static and transient
conditions by proper selection of package, cooling, rDS(on), current limit, fault timeout, and power limit. The design
procedure further assumes that a unit running at full load and maximum ambient temperature experiences a brief
input-power interruption sufficient to discharge COUT, but short enough to keep M1 from cooling. A full COUT
recharge then takes place. Adjust this procedure to fit your application and design criteria.
Figure 34. Simplified Block Diagram of the System Constructed in the Design Example
STEP 1. Choose RSENSE
From the TPS24710/11/12/13 electrical specifications, the current-limit threshold voltage, V(VCC – SENSE), is around
25 mV. A resistance of 2 m
is selected for the peak current limit of 12 A, while dissipating only 200 mW at the
rated 10-A current (see Equation 5). This represents a 0.17% power loss.
(5)
STEP 2. Choose MOSFET M1
The next design step is to select M1. The TPS24710/11/12/13 is designed to use an N-channel MOSFET with a
gate-to-source voltage rating of 20 V.
Devices with lower gate-to-source voltage ratings can be used if a Zener diode is connected so as to limit the
maximum gate-to-source voltage across the transistor.
22
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS24710 TPS24711 TPS24712 TPS24713
相關(guān)PDF資料
PDF描述
TPS24710 POWER SUPPLY SUPPORT CKT, PDSO10
TPS24711 POWER SUPPLY SUPPORT CKT, PDSO10
TPS24711DGSR POWER SUPPLY SUPPORT CKT, PDSO10
TPS2481PW POWER SUPPLY SUPPORT CKT, PDSO20
TPS2480PW POWER SUPPLY SUPPORT CKT, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TPS24710EVM-003 功能描述:電源管理IC開發(fā)工具 TPS24710 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS24711DGS 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
TPS24711DGSR 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
TPS24711EVM-004 功能描述:電源管理IC開發(fā)工具 TPS24711 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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