參數(shù)資料
型號(hào)： TPS24711DGSR
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(yè)數(shù)： 8/34頁(yè)
文件大?。?/td> 2148K
代理商： TPS24711DGSR
C002
I_IN:InputCurrent,2 A/div
GAT:VoltageonGATEPin,5V/div
V_DS:Drain-to-SourceVoltageofM1,5V/div
TIMER:Voltageon TIMERPin,500mV/div
FET_PWR:PoweronM1(productofV_DSandI_IN),19W/div
Time:10ms/div
SLVSAL2C
– JANUARY 2011 – REVISED MAY 2011
Figure 27. Computation of M1 Power Stress During Start-Up
CIRCUIT BREAKER AND FAST TRIP
The TPS24710/11/12/13 monitors load current by sensing the voltage across RSENSE. The TPS24710/11/12/13
incorporates two distinct thresholds: a current-limit threshold and a fast-trip threshold.
The functions of circuit breaker and fast-trip turn off are shown in Figure 28 through Figure 31.
Figure 28 shows the behavior of the TPS24710/11 when a fault in the output load causes the current passing
through RSENSE to increase to a value above the current limit but less than the fast-trip threshold. When the
current exceeds the current-limit threshold, a current of approximately 10
μA begins to charge timing capacitor
CT. If the voltage on CT reaches 1.35 V, then the external MOSFET is turned off. The TPS24710 latches off and
the TPS24711 commences a restart cycle. In either event, fault pin FLTb pulls low to signal a fault condition.
Overload between the current limit and the fast trip threshold is permitted for this period. This shutdown scheme
is sometimes called an electronic circuit breaker.
The fast-trip threshold protects the system against a severe overload or a dead short circuit. When the voltage
across the sense resistor RSENSE exceeds the 60 mV fast-trip threshold, the GATE pin immediately pulls the
external MOSFET gate to ground with approximately 1 A of current. This extremely rapid shutdown may
generate disruptive transients in the system, in which case a low-value resistor inserted between the GATE pin
and the MOSFET gate can be used to moderate the turn off current. The fast-trip circuit holds the MOSFET off
for only a few microseconds, after which the TPS24710/11/12/13 turns back on slowly, allowing the current-limit
feedback loop to take over the gate control of M1. Then the hot-swap circuit goes into either latch mode
(TPS24710/12) or auto-retry mode (TPS24711/13). Figure 30 and Figure 31 illustrate the behavior of the system
implementing TPS24710/11 when the current exceeds the fast-trip threshold.
16
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS24710 TPS24711 TPS24712 TPS24713
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TPS24712DGSR 功能描述:熱插拔功率分布 2.5-18V Hi Eff Pwr- Ltd Hot-Swap Cntrlr 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
TPS24713DGS 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
TPS24713DGSR 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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