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參數資料
| 型號： | TPS2480PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁數： | 19/56頁 |
| 文件大小： | 1381K |
| 代理商： | TPS2480PW |
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SLUS939B – APRIL 2010 – REVISED DECEMBER 2010
www.ti.com
Additional Design Considerations
Use of PG
Use the PG pin to control and sequence a downstream DC/DC converter. If this is not done a long time delay
may be needed to allow CO to fully charge before the converter starts.
Output Clamp Diode
Inductive loads on the output may drive the OUT pin below GND when the circuit is unplugged or during current
limit. The OUT pin ratings can be maintained with a small diode such as an S1B, between the TPS2480/81 OUT
to GND pins.
Gate Clamp Diode
The TPS2480/81 has a relatively well-regulated gate voltage of 12 V to 16 V, even at low supply voltages. A
small clamp Zener from gate to source of M1, such as a BZX84C7V5, is recommended if VGS of M1 is rated
below this.
High Gate Capacitance Applications
Gate voltage overstress and large fault current spikes can be caused by large gate capacitance. An external gate
clamp Zener diode is recommended if the total gate capacitance of M1 exceeds 4000 pF. When gate capacitor
dV/dT control is used, a 1-k
combination is used for MOSFETs with CISS less than 3000 pF, then a Zener is not required.
Input Transient Protection
The maximum recommended bus voltage is lower than the absolute maximum voltage ratings on VINP and
VINM solely to provide margin for transients on the bus. The TPS2480 will operate properly up to the absolute
maximum voltage ratings on VINP and VINM.
Hotswap systems experience positive transients on their input during hotplug or rapid turnoff with high current
due to inductance in the input circuit. These same systems experience negative transients on the output during
rapid turnoff with high current due to inductance in the output circuit. The TPS2480 may not require operational
voltage margin below the absolute maximum if it is operated from a non-inductive input. An example is an
application where the TPS2480 is used as an output protector with a large input capacitance located directly at
the input terminals.
Transient protection, e.g. a TVS diode (transient voltage suppressor, a type of Zener diode), may be required on
the input in addition to a bypass capacitor if the system design does not inherently limit transient voltages below
the absolute maximum ratings. An example of this is a system with significant input inductance. If a TVS is
required, it must protect to the absolute maximum ratings at the worst case clamping current.
An output voltage clamp diode may be required on the output to limit negative transients if the local output
capacitance does not adequately control it. An example of this is a system with significant output bus inductance
and little local capacitance. Select a schottky diode with low forward voltage at the anticipated current during an
output short.
26
Copyright 2010, Texas Instruments Incorporated
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS2480PWR | 功能描述:熱插拔功率分布 Pos Vltg,Int Prot Dev/Hotswap Cntrlr RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2481EVM-001 | 功能描述:電源管理IC開發工具 Eval Mod for TPS2481 RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS2481PW | 功能描述:熱插拔功率分布 Pos VltgInt Prot Dev/Hotswap Cntrlr RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2481PWR | 功能描述:熱插拔功率分布 Pos VltgInt Prot Dev/Hotswap Cntrlr RoHS:否 制造商:Texas Instruments 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2482PW | 制造商:Texas Instruments 功能描述:Hot Swap Controller 1-CH 80V 20-Pin TSSOP Tube 制造商:Texas Instruments 功能描述:IC CTRLR HOT SWAP 9-36V 20TSSOP 制造商:Texas Instruments 功能描述:36V Hotswap Cntlr w/ Digital Pwr Monitor |
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