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參數(shù)資料
| 型號(hào)： | TPS2045P |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| 中文描述： | 限流配電開關(guān) |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 406K |
| 代理商： | TPS2045P |
TPS2045, TPS2055
CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
SLVS182 – APRIL 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
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
Self-powered and bus-powered hubs distribute data and power to downstream functions. The TPS2045 and
TPS2055 can provide power-distribution solutions for many of these classes of devices.
Bus-powered hubs obtain all power from upstream ports and often contain an embedded function. The hubs
are required to power up with less than one unit load. The BPH usually has one embedded function, and power
is always available to the controller of the hub. If the embedded function and hub require more than 100 mA
on power up, the power to the embedded function may need to be kept off until enumeration is completed. This
can be accomplished by removing power or by shutting off the clock to the embedded function. Power switching
the embedded function is not necessary if the aggregate power draw for the function and controller is less than
one unit load. The total current drawn by the bus-powered device is the sum of the current to the controller, the
embedded function, and the downstream ports, and it is limited to 500 mA from an upstream port.
low-power bus-powered functions and high-power bus-powered functions
Both low-power and high-power bus-powered functions obtain all power from upstream ports; low-power
functions always draw less than 100 mA; high-power functions must draw less than 100 mA at power up and
can draw up to 500 mA after enumeration. If the load of the function is more than the parallel combination of
44
and 10
μ
F at power up, the device must implement inrush current limiting (see Figure 31).
IN
OC
EN
GND
1
0.1
μ
F
2,3
5
4
6, 7, 8
0.1
μ
F
10
μ
F
GND
OUT
TPS2045
Power Supply
3.3 V
D+
D–
VBUS
USB
Control
10
μ
F
Internal
Function
Figure 31. High-Power Bus-Powered Function
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2045PE4 | 功能描述:電源開關(guān) IC - USB DUAL HI-SIDE MOSFET RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2046 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| TPS2046A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| TPS2046AD | 功能描述:電源開關(guān) IC - USB Dl .345A 2.7-5.5V Hi RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| TPS2046ADG4 | 功能描述:電源開關(guān) IC - USB 0.345A 2.7-5.5V Dual Hi-Side MOSFET RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
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