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參數(shù)資料
| 型號： | TPS203X |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | USB POWER DISTRIBUTION |
| 中文描述： | USB電源分布 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大小： | 116K |
| 代理商： | TPS203X |
USB Power Distribution for Self-Powered Hubs (Including Hosts)
5
TPS202x/3x and TPS204x/5x USB Power Distribution
USB Power Distribution for Self-Powered Hubs (Including Hosts)
Self-powered hubs (SPH) have a local power supply that powers nonremovable
functions and the downstream ports (Figure 2). The hub must supply 5.25 V to
4.75 V on the board side of the downstream connection under full-load and
no-load conditions and is required to have current limit and report overcurrent
conditions to USB software. Typical SPHs are desktop PCs, monitors, printers,
and stand alone hubs.
Power for the hub controller may be supplied by the local power supply or by the
upstream voltage bus for loads up to 100 mA. The advantage of using the power
from the upstream port is that communication to the hub controller is possible and
the distinction between an unconnected and unpowered device can be made.
Most hub controllers use 3.3-V supply voltage, and a low drop-out (LDO) voltage
regulator is needed to regulate the 5-V bus voltage to 3.3 V.
The number of downstream ports supported by self-powered hubs is limited by
the current the local power supply can support and by safety concerns. Each port
must be capable of supplying 5 unit loads and must limit current when the
aggregate current drawn exceeds 5.0 A. The current limit should exceed the
continuous current level of 500 mA by enough to ensure that dynamic-attach
events and startup currents do not trip the overcurrent protection. Figure 2 shows
a typical SPH.
Hub Controller
TUSB2070
TUSB2040
TUSB2140
LDO
Regulator
TPS7133
TPS7233
LDO
Regulator
TPS7133
TPS7233
Nonremovable
Function
Current Limit
TPS2041/51
TPS2042/52
TPS2044/54
TPS2022/23/24
TPS2032/33/34
Current Limit
TPS2041/51
TPS2042/52
TPS2044/54
TPS2022/23/24
TPS2032/33/34
On/Off
Local
Power
Supply
500 mA/Port
500 mA/Port
Downstream
Voltage Bus
Downstream
Voltage Bus
Downstream Data Port
Upstream Data Port
Upstream
Voltage Bus
1 Unit Load (max)
On/Off
Figure 2. Self Powered Hub
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS2032P | POWER-DISTRIBUTION SWITCHES |
| TPS2033P | POWER-DISTRIBUTION SWITCHES |
| TPS2052P | DUAL POWER-DISTRIBUTION SWITCHES |
| TPS2100D | VAUX POWER-DISTRIBUTION SWITCHES |
| TPS2100DBV | VAUX POWER-DISTRIBUTION SWITCHES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS2041 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:POWER DISTRIBUTION SWITCHES |
| TPS2041A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES |
| TPS2041AD | 功能描述:電源開關(guān) IC - USB 0.7A 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 |
| TPS2041ADG4 | 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 |
| TPS2041ADR | 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 |
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