參數(shù)資料
型號： TPS2061DRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 10/40頁
文件大小： 1325K
代理商： TPS2061DRG4
SLVS490I – DECEMBER 2003 – REVISED OCTOBER 2009
www.ti.com
UNDERVOLTAGE LOCKOUT (UVLO)
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 is 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 also keeps the switch from being turned on until the power supply has reached at least 2 V, even if the
switch is enabled. On reinsertion, the power switch is turned on, with a controlled rise time to reduce EMI and
voltage overshoots.
UNIVERSAL SERIAL BUS (USB) APPLICATIONS
The universal serial bus (USB) interface is a 12-Mb/s, or 1.5-Mb/s, multiplexed serial bus designed for
low-to-medium bandwidth PC peripherals (e.g., keyboards, printers, scanners, and mice). The four-wire USB
interface is conceived for dynamic attach-detach (hot plug-unplug) of peripherals. Two lines are provided for
differential data, and two lines are provided for 5-V power distribution.
USB data is a 3.3-V level signal, but power is distributed at 5 V to allow for voltage drops in cases where power
is distributed through more than one hub across long cables. Each function must provide its own regulated 3.3 V
from the 5-V input or its own internal power supply.
The USB specification defines the following five classes of devices, each differentiated by power-consumption
requirements:
Hosts/self-powered hubs (SPH)
Bus-powered hubs (BPH)
Low-power, bus-powered functions
High-power, bus-powered functions
Self-powered functions
SPHs and BPHs distribute data and power to downstream functions. The TPS206x has higher current capability
than required by one USB port; so, it can be used on the host side and supplies power to multiple downstream
ports or functions.
HOST/SELF-POWERED AND BUS-POWERED HUBS
Hosts and SPHs have a local power supply that powers the embedded functions and the downstream ports (see
Figure 27). This power supply must provide from 5.25 V to 4.75 V to the board side of the downstream
connection under full-load and no-load conditions. Hosts and SPHs are required to have current-limit protection
and must report overcurrent conditions to the USB controller. Typical SPHs are desktop PCs, monitors, printers,
and stand-alone hubs.
18
Copyright 2003–2009, Texas Instruments Incorporated
相關(guān)PDF資料
PDF描述
TPS2062DRG4 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
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TPS2062DR 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2061EVM-290 功能描述:交換機 IC 開發(fā)工具 TPS2061EVM-290 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V
TPS2061EVM-292 功能描述:交換機 IC 開發(fā)工具 TPS2061EVM-292 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V
TPS2062 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES
TPS2062-1 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES
TPS2062-1EVM-293 功能描述:交換機 IC 開發(fā)工具 TPS2062-1EVM-293 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:USB Power Switches 工具用于評估:MAX4984E 工作電源電壓:2.8 V to 5.5 V
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