參數(shù)資料
型號(hào)： TPS24710
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： POWER SUPPLY SUPPORT CKT, PDSO10
封裝： GREEN, PLASTIC, MSOP-10
文件頁(yè)數(shù)： 7/34頁(yè)
文件大?。?/td> 2148K
代理商： TPS24710
SLVSAL2C
– JANUARY 2011 – REVISED MAY 2011
Figure 26. Inrush Mode at Hot-Swap Circuit Insertion
INRUSH OPERATION
When the TPS24710/11/12/13 activates the pass MOSFET, M1, a current flows into the downstream bulk storage
capacitors. When this current exceeds the limit set by the power limit engine, the gate of the MOSFET is
regulated by a feedback loop to make the MOSFET current rise in a controlled manner. This not only limits the
inrush current charging capacitance but it also limits the power dissipation of the MOSFET to safe levels. A more
complete explanation of the power limiting scheme is given in the section entitled Action of the Constant Power
Engine. At the instant when the current in RSENSE reaches the programmed limit, the TIMER pin begins to charge
the timing capacitor CT with a current of approximately 10 μA. The TIMER pin continues to charge CT until
V(GATE – VCC) reaches the timer activation voltage (6 V for VVCC = 12 V). The TIMER then begins to discharge CT
with a current of approximately 10
μA. This indicates that the inrush mode is finished. If the TIMER exceeds its
upper threshold of 1.35 V before V(GATE – VCC) reaches the timer activation voltage, the GATE pin is pulled to
GND and the hot-swap circuit enters either latch mode (TPS24710/12) or auto-retry mode (TPS24711/13).
The power limit feature is disabled once the inrush operation is finished and the hotswap circuit becomes a
circuit breaker. The TPS24710/11/12/13 will turn off the MOSFET, M1, after a fault timer period once the load
exceeds the current limit threshold.
ACTION OF THE CONSTANT-POWER ENGINE
Figure 27 illustrates the operation of the constant-power engine during start-up. The circuit used to generate the
waveforms of Figure 27 was programmed to a power limit of 29.3 W by means of the resistor connected between
PROG and GND. At the moment current begins to flow through the MOSFET, a voltage of 12 V appears across
it (input voltage VVCC = 12 V), and the constant-power engine therefore allows a current of 2.44 A (equal to 29.3
W divided by 12 V) to flow. This current increases in inverse ratio as the drain-to-source voltage diminishes, so
as to maintain a constant dissipation of 29.3 W. The constant-power engine adjusts the current by altering the
reference signal fed to the current limit amplifier. The lower part of Figure 28 shows the measured power
dissipated within the MOSFET, labeled FET PWR, remaining substantially constant during this period of
operation, which ends when the current through the MOSFET reaches the current limit ILIM. This behavior can be
considered a form of foldback limiting, but unlike the standard linear form of foldback limiting, it allows the power
device to operate near its maximum capability, thus reducing the start-up time and minimizing the size of the
required MOSFET.
Copyright
2011, Texas Instruments Incorporated
15
Product Folder Link(s): TPS24710 TPS24711 TPS24712 TPS24713
相關(guān)PDF資料
PDF描述
TPS24711 POWER SUPPLY SUPPORT CKT, PDSO10
TPS24711DGSR POWER SUPPLY SUPPORT CKT, PDSO10
TPS2481PW POWER SUPPLY SUPPORT CKT, PDSO20
TPS2480PW POWER SUPPLY SUPPORT CKT, PDSO20
TPS2490DGSRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS24710DGS 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
TPS24710DGSR 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
TPS24710EVM-003 功能描述:電源管理IC開(kāi)發(fā)工具 TPS24710 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*