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参数资料
| 型号： | TPS2420RSAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 4 X 4 MM, PLASTIC, QFN-16 |
| 文件页数： | 6/29页 |
| 文件大小： | 1368K |
| 代理商： | TPS2420RSAR |
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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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| TPS2420RSAT | 功能描述:热插拔功率分布 Int FET 0-5A Dual Fault Threshold RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
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| TPS2421-1DDA | 功能描述:热插拔功率分布 3-20V Integ FET 0-5A Hot Swap RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2421-1DDAR | 功能描述:热插拔功率分布 3-20V Integ FET 0-5A Hot Swap RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2421-1EVM-02 | 功能描述:电源管理IC开发工具 TPS2421-1 Hot Swap Controller Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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