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參數資料
| 型號： | TPS2211APW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁數： | 5/25頁 |
| 文件大小： | 580K |
| 代理商： | TPS2211APW |
TPS2211A
SINGLESLOT PC CARD POWER INTERFACE SWITCH
FOR PARALLEL PCMCIA CONTROLLERS
SLVS282B SEPTEMBER 2000 REVISED JULY 2005
13
WWW.TI.COM
APPLICATION INFORMATION
designing for voltage regulation
The current PCMCIA specification for output voltage regulation of the 5-V output is 5% (250 mV). In a typical
PC power-system design, the power supply has an output voltage regulation (VPS(reg)) of 2% (100 mV). Also,
a voltage drop from the power supply to the PC Card results from resistive losses (VPCB) in the PCB traces and
the PCMCIA connector. A typical design limits the total of these resistive losses to less than 1% (50 mV) of the
output voltage. Therefore, the allowable voltage drop (VDS) for the TPS2211 is the PCMCIA voltage regulation
less the power supply regulation and less the PCB and connector resistive drops:
V
DS +
V
O reg
–V
PS reg
–V
PCB
Typically, this leaves 100 mV for the allowable voltage drop across the TPS2211A. The voltage drop is the output
current multiplied by the switch resistance of the TPS2211. Therefore, the maximum output current that can be
delivered to the PC Card in regulation is the allowable voltage drop across the TPS2211A divided by the output
switch resistance.
I
O
max
+
V
DS
r
DS on
The AVCC outputs deliver 1 A continuous at 5 V and 3.3 V within regulation over the operating temperature
range. Using the same equations, the PCMCIA specification for output voltage regulation of the 3.3 V output
is 300 mV. Using the voltage drop percentages for power supply regulation (2%) and PCB resistive loss (1%),
the allowable voltage drop for the 3.3 V switch is 200 mV. The 12-V outputs (AVPP) of the TPS2211A can deliver
150 mA continuously.
overcurrent and overtemperature protection
PC Cards are inherently subject to damage from mishandling. Host systems require protection against
short-circuited cards that could lead to power supply or PCB trace damage. Even systems sufficiently robust
to withstand a short circuit would still undergo rapid battery discharge into the damaged PC Card, resulting in
a sudden loss of system power. Most hosts include fuses for protection. The reliability of fused systems is poor
and requires troubleshooting and repair, usually by the manufacturer, when fuses are blown.
The TPS2211A uses sense FETs to check for overcurrent conditions in each of the AVCC and AVPP outputs.
Unlike sense resistors or polyfuses, these FETs do not add to the series resistance of the switch; therefore
voltage and power losses are reduced. Overcurrent sensing is applied to each output separately. When an
overcurrent condition is detected, only the power output affected is limited; all other power outputs continue to
function normally. The OC indicator, normally a logic high, is a logic low when an overcurrent condition is
detected providing for initiation of system diagnostics and/or sending a warning message to the user.
During power up, the TPS2211A controls the rise time of the AVCC and AVPP outputs and limits the current
into a faulty card or connector. If a short circuit is applied after power is established (e.g., hot insertion of a bad
card), current is initially limited only by the impedance between the short and the power supply. In extreme
cases, as much as 10 A to 15 A may flow into the short before the current limiting of the TPS2211A engages.
If the AVCC or AVPP outputs are driven below ground, the TPS2211A may latch nondestructively in an off state.
Cycling power reestablishes normal operation.
Overcurrent limiting for the AVCC outputs is designed to activate if powered up into a short in the range of
1 A to 2.5 A, typically at about 1.6 A. The AVPP outputs limit from 180 mA to 400 mA, typically around 280 mA.
The protection circuitry acts by linearly limiting the current passing through the switch rather than initiating a full
shutdown of the supply. Shutdown occurs only during thermal limiting.
Thermal limiting prevents destruction of the IC from overheating if the package power dissipation ratings are
exceeded. Thermal limiting disables power output until the device has cooled.
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相關代理商/技術參數 |
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| TPS2211APWG4 | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch 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 |
| TPS2211APWP | 功能描述:熱插拔功率分布 PCMCIA Pwr Intfce Sw 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 |
| TPS2211APWPG4 | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch 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 |
| TPS2211APWPR | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch 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 |
| TPS2211APWPRG4 | 功能描述:熱插拔功率分布 1A Sngl-Slot PC Card Power Switch 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 |
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