參數(shù)資料
型號(hào)： TPS2420RSAR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16
封裝： 4 X 4 MM, PLASTIC, QFN-16
文件頁(yè)數(shù)： 6/29頁(yè)
文件大?。?/td> 1368K
代理商： TPS2420RSAR
2
IN
MIN
V
R
12
=
(
)
NOM
LOAD
SPIKE absolute
L
V
I
C
=
+
( )
straightwire
4 L
L
0.2 L ln
0.75
nH
D
-
÷
è
SLUS903C – JANUARY 2009 – REVISED AUGUST 2010
www.ti.com
APPLICATION INFORMATION
If EN is tied to GND at startup and VIN does not ramp quickly the TPS2420 may momentarily turn off then on
during startup. This can happen if a capacitive load momentarily pulls down the input voltage below the UV
threshold. If necessary, this can be avoided by delaying EN assertion until VIN is fully up.
Maximum Load
The power limiting function of the TPS2420 provides very effective protection for the internal FET. Expectedly,
there is a supply voltage dependent maximum load which the device will be able to power up. Loads above this
level may cause the device to shut off current before startup is complete. Neglecting any load capacitance, the
maximum load ( minimum load resistance ) is calculated using the equation;
(7)
Adding load capacitance may reduce the maximum load which can be present at start up.
Transient Protection
The need for transient protection in conjunction with hot-swap controllers should always be considered. When
the TPS2420 interrupts current flow, input inductance generates a positive voltage spike on the input and output
inductance generates a negative voltage spike on the output. Such transients can easily exceed twice the supply
voltage if steps are not taken to address the issue. Typical methods for addressing transients include;
Minimizing lead length/inductance into and out of the device
Voltage Suppressors (TVS) on the input to absorb inductive spikes
Shottky diode across the output to absorb negative spikes
A combination of ceramic and electrolytic capacitors on the input and output to absorb energy
Use PCB GND plane
The following equation estimates the magnitude of these voltage spikes:
where
VNOM is the nominal supply voltage
ILOAD is the load current
C is the capacitance present at the input or output of the TPS2420
L equals the effective inductance seen looking into the source or the load
(8)
Calculating the inductance due to a straight length of wire is shown in Equation 9.
where
L is the length of the wire
D is diameter of the wire
(9)
Some applications may require the addition of a TVS to prevent transients from exceeding the absolute ratings if
sufficient capacitance cannot be included.
14
Copyright 2009–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS2420
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2420RSAT 功能描述:熱插拔功率分布 Int FET 0-5A Dual Fault Threshold 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
TPS2420RSAT 制造商:Texas Instruments 功能描述:Hot Swap Contoller IC
TPS2421-1DDA 功能描述:熱插拔功率分布 3-20V Integ FET 0-5A Hot Swap 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
TPS2421-1DDAR 功能描述:熱插拔功率分布 3-20V Integ FET 0-5A Hot Swap 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
TPS2421-1EVM-02 功能描述:電源管理IC開(kāi)發(fā)工具 TPS2421-1 Hot Swap Controller 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
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