- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98279 > TPS2112PW (TEXAS INSTRUMENTS INC) 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 PDF資料下載
參數(shù)資料
| 型號： | TPS2112PW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, PLASTIC, TSSOP-8 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大?。?/td> | 373K |
| 代理商： | TPS2112PW |
TPS2112
TPS2113
SLVS446 – DECEMBER 2002
www.ti.com
16
DETAILED DESCRIPTION
AUTO-SWITCHING MODE
The TPS2112/3 only supports the auto-switching mode. In this mode, OUT connects to IN1 if VI(VSNS) is greater
than 0.8 V, otherwise OUT connects to the higher of IN1 and IN2.
The VSNS terminal includes hysteresis equal to 3.75–7.5% of the threshold selected for transition from the
primary supply to the higher of the two supplies. This hysteresis helps avoid repeated switching from one supply
to the other due to resistive drops.
N-CHANNEL MOSFETs
Two internal high-side power MOSFETs implement a single-pole double-throw (SPDT) switch. Digital logic
selects the IN1 switch, IN2 switch, or no switch (Hi-Z state). The MOSFETs have no parallel diodes so
output-to-input current cannot flow when the FET is off. An integrated comparator prevents turn-on of a FET
switch if the output voltage is greater than the input voltage.
CROSS-CONDUCTION BLOCKING
The switching circuitry ensures that both power switches will never conduct at the same time. A comparator
monitors the gate-to-source voltage of each power FET and allows a FET to turn on only if the gate-to-source
voltage of the other FET is below the turn-on threshold voltage.
REVERSE-CONDUCTION BLOCKING
When the TPS211x switches from a higher-voltage supply to a lower-voltage supply, current can potentially flow
back from the load capacitor into the lower-voltage supply. To minimize such reverse conduction, the TPS211x
will not connect a supply to the output until the output voltage has fallen to within 100 mV of the supply voltage.
Once a supply has been connected to the output, it will remain connected regardless of output voltage.
CHARGE PUMP
The higher of supplies IN1 and IN2 powers the internal charge pump. The charge pump provides power to the
current limit amplifier and allows the output FET gate voltage to be higher than the IN1 and IN2 supply voltages.
A gate voltage that is higher than the source voltage is necessary to turn on the N-channel FET.
CURRENT LIMITING
A resistor RILIM from ILIM to GND sets the current limit to 250/ RILIM and 500/RILIM for the TPS2112 and
TPS2113, respectively. Setting resistor RILIM equal to zero is not recommended as that disables current limiting.
OUTPUT VOLTAGE SLEW-RATE CONTROL
The TPS2112/3 slews the output voltage at a slow rate when OUT switches to IN1 or IN2 from the Hi-Z state
(see Truth Table). ). A slow slew rate limits the inrush current into the load capacitor. High inrush currents can
glitch the voltage bus and cause a system to hang up or reset. It can also cause reliability issues—like pit the
connector power contacts, when hot plugging a load like a PCI card. The TPS2112/3 slews the output voltage
at a much faster rate when OUT switches between IN1 and IN2. The fast rate minimizes the output voltage
droop and reduces the output voltage hold-up capacitance requirement.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS2112PWRG4 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2113PWG4 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2114APW | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2115ADRBTG4 | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| TPS2114PW | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2112PWG4 | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2112PWR | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2112PWRG4 | 功能描述:電源開關(guān) IC - 配電 Dual In/Single Out Autoswitch Power MUX RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| TPS2113ADRBR | 功能描述:多路器開關(guān) IC Autoswitching Pwr Mux RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| TPS2113ADRBT | 功能描述:多路器開關(guān) IC Autoswitching Pwr Mux RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。