參數(shù)資料
型號(hào)： TPS2012APWPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14
封裝： PLASTIC, HTSSOP-14
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 1282K
代理商： TPS2012APWPG4
www.ti.com
THERMAL PROTECTION
UNDERVOLTAGE LOCKOUT (UVLO)
GENERIC HOT-PLUG APPLICATIONS (see Figure 36)
SLVS189C – DECEMBER 1998 – REVISED SEPTEMBER 2007
Where:
TA = Ambient Temperature °C
RθJA = Thermal resistance SOIC = 172°C/W
Compare the calculated junction temperature with the initial estimate. If they do not agree within a few degrees,
repeat the calculation, using the calculated value as the new estimate. Two or three iterations are generally
sufficient to get an acceptable answer.
Thermal protection prevents damage to the IC when heavy-overload or short-circuit faults are present for
extended periods of time. The faults force the TPS201xA into constant current mode, which causes the voltage
across the high-side switch to increase; under short-circuit conditions, the voltage across the switch is equal to
the input voltage. The increased dissipation causes the junction temperature to rise to high levels. The protection
circuit senses the junction temperature of the switch and shuts it off. Hysteresis is built into the thermal sense
circuit, and after the device has cooled approximately 20 degrees, the switch turns back on. The switch continues
to cycle in this manner until the load fault or input power is removed.
An undervoltage lockout ensures that the power switch is in the off state at power up. Whenever the input
voltage falls below approximately 2 V, the power switch will be quickly turned off. This facilitates the design of
hot-insertion systems where it is not possible to turn off the power switch before input power is removed. The
UVLO will also keep the switch from being turned on until the power supply has reached at least 2 V, even if the
switch is enabled. Upon reinsertion, the power switch will be turned on, with a controlled rise time to reduce EMI
and voltage overshoots.
In many applications it may be necessary to remove modules or p-c boards while the main unit is still operating.
These are considered hot-plug applications. Such implementations require the control of current surges seen by
the main power supply and the card being inserted. The most effective way to control these surges is to limit and
slowly ramp the current and voltage being applied to the card, similar to the way in which a power supply
normally turns on. Because of the controlled rise times and fall times of the TPS201xA series, these devices can
be used to provide a softer start-up to devices being hot-plugged into a powered system. The UVLO feature of
the TPS201xA also ensures the switch will be off after the card has been removed, and the switch will be off
during the next insertion. The UVLO feature guarantees a soft start with a controlled rise time for every insertion
of the card or module.
Figure 36. Typical Hot-Plug Implementation
By placing the TPS201xA between the VCC input and the rest of the circuitry, the input power will reach this
device first after insertion. The typical rise time of the switch is approximately 9 ms, providing a slow voltage
ramp at the output of the device. This implementation controls system surge currents and provides a
hot-plugging mechanism for any device.
Copyright 1998–2007, Texas Instruments Incorporated
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TPS2012APWPR 功能描述:電源開(kāi)關(guān) IC - 配電 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
TPS2012APWPRG4 功能描述:電源開(kāi)關(guān) IC - 配電 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
TPS2012B 功能描述:臺(tái)式示波器 Digital ColorDisplay 100MHz 1GS/s 2-Ch RoHS:否 制造商:Teledyne LeCroy 通道:4 帶寬:1 GHz 采樣比:2.5 GS/s 顯示器類型:Color TFT, LCD 輸入電壓:100 VAC to 240 VAC 設(shè)備類型:Digital Oscilloscopes 電纜類型:Global Power Cord Sets Included
TPS2012D 功能描述:電源開(kāi)關(guān) IC - 配電 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
TPS2012DG4 功能描述:電源開(kāi)關(guān) IC - 配電 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)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
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